unreasonable;  unnatural;  impossible;  forcible;  forced;  excessive (work, etc.);  immoderate
 futility;  waste;  uselessness;  pointlessness;  idleness
 innumerable;  countless;  numberless
 of course;  certainly;  naturally
 absurd;  unreasonable;  excessive;  very;  extremely;  excessively
 unconsciousness;  unconscious;  involuntary;  the unconscious (psychoanalysis)
 lack of expression;  blank look (on one's face)
 nonsense;  no meaning;  meaningless
 powerlessness;  helplessness;  incompetent
 defenseless;  defenceless;  unprotected;  vulnerable
 useless;  futile;  unnecessary;  needless;  not on business;  unrelated
 easy;  simple;  ready;  casual;  off-hand;  easy-going
 unhurt;  uninjured;  flawless (e.g. gem);  unblemished;  spotless (e.g. reputation);  faultless (e.g. performance)
 unmanned;  uninhabited;  unattended;  shorthandedness;  lack of help
 unmanned;  uninhabited;  unattended;  shorthandedness;  lack of help
 incompetence;  inefficiency;  inability;  incompetent person
 invincible;  unrivaled;  unrivalled;  matchless;  unbeatable;  undefeatable
 radio (communication);  wireless;  not using wires
 existence or nonexistence;  presence or absence;  consent or refusal;  yes or no
 existence or nonexistence;  presence or absence;  consent or refusal;  yes or no
 unrelated;  unconnected;  without relations (esp. of a deceased person);  having no surviving relatives;  unrelated to the teachings of Buddha;  unable to be saved by Buddha
 regret;  chagrin;  mortification;  freedom from obstructive thoughts
 free (of charge);  gratuitous
 cruel;  merciless;  atrocious;  pitiful;  tragic;  horrible
 pure;  innocent;  pure;  unmixed;  long kimono made from the same plain-coloured cloth
 invalid;  void;  ineffective;  unavailable
 very much;  intensely;  overwhelmingly;  excessively;  irresistibly;  without any obvious reason
 ignorance;  innocence;  stupidity
 taciturn;  reticent;  quiet;  silent;  untalkative
 innocence;  guiltlessness;  absence of the fact;  insubstantiality; (arch.)  insincerity; (arch.)  dishonesty
 merciless;  ruthless;  pitiless;  unfeeling
 innocence;  insentient (i.e. plants, inanimate objects, etc.);  free from obstructive thoughts;  to pester someone (for cash, etc.)
 heartlessness;  hardness of heart;  coldheartedness;  insentient;  inanimate
 insensitive;  inconsiderate;  callous;  thick-skinned
 nameless;  unnamed;  obscure;  unknown;  causeless;  unjustifiable
 unaware;  unmindful;  unconscious;  blind;  apathetic
 indiscrimination;  without discrimination;  indiscriminate
 peerless;  unparalleled;  unparallelled;  mowing down the enemy
 innocence;  being not guilty
 thoughtless;  reckless;  rash;  excessive;  unreasonable;  immoderate
 unlimited;  unrestricted;  limitless
 without an occupation;  unemployed;  jobless
 apathy;  indifference;  listlessness;  athymia
 indifferent;  unconcerned;  nonchalant;  unmindful;  inattentive;  careless
 indifferent;  unconcerned;  nonchalant;  unmindful;  inattentive;  careless
 disorder;  chaos;  confusion
 moonless sky (poetic usage)
 mob;  the masses;  rabble;  riffraff
 bluntly (refusing, etc.);  flatly;  out of hand;  completely
 apathy;  lassitude;  lethargy;  languor
 lawlessness;  injustice;  wrong;  outrageous;  lawless;  disorderly
 unimpressive;  unimpressed
 peerless;  matchless;  unparalleled;  unrivalled;  unequalled;  incomparable
 lack of policy;  having no measures;  lacking means
 intangible;  incorporeal;  by force;  outrageous;  making light of;  making fun of
 to bring to naught;  to bring to nought;  to abuse (esp. another's kindness);  to empty;  to clear
 without permission;  without notice
 matchless;  unequalled;  unequaled
 plain;  unfigured;  patternless;  solid (color)
 to not make good use of (e.g. advice);  to disregard;  to treat as useless;  to treat with disdain
 colourless;  colorless;  achromatic;  neutral (position);  impartial
 peerless;  unparalleled;  unparallelled
 abstract;  immaterial;  moral;  spiritual;  intangible
 weightlessness;  zero gravity
 random;  unintentional;  unintended
 unselfish;  disinterested;  unavaricious;  free of avarice
 supreme;  greatest;  highest;  best
 lacking a plan;  haphazard
 empty-handed;  unarmed;  lacking funds
 unauthorized;  without permission;  unapproved;  lack of permission;  absence of authorization
 illiteracy;  ignorance;  arhat;  someone who has attained nirvana
 selflessness;  self-effacement;  self-renunciation;  anatta;  anatman;  doctrine that states that humans do not possess souls
 easy;  simple;  ready;  casual;  off-hand;  easy-going
 trackless;  reckless;  dissipated
 windless;  calm;  quiet (state of affairs);  peaceful;  stable
 thoughtlessness;  indiscretion
 lack of understanding;  lack of sympathy
 inexhaustibility;  mutual financing association
 nothing;  nil;  naught;  nought
 ignorance;  innocence;  stupidity
 numb;  insensitive (e.g. to pain);  apathetic;  insensitive;  indifferent
 odorless;  odourless;  unscented
 unselfish;  selfless;  disinterested
 inconstant;  unchastity;  unprincipled
 unsigned;  without a signature
 sterilised;  sterilized;  sterile;  pasteurised;  pasteurized;  germ-free
 independent (esp. in politics);  non-partisan
 unlicensed;  without a license (licence)
 ceaselessness;  incessancy;  the Avici hell
 baseless;  groundless;  unfounded;  without evidence
 tasteless;  flavourless;  uninteresting;  dull;  dry
 having no hobbies;  lacking interests;  humdrum;  tasteless;  prosaic;  vulgar
 inhuman;  immoral;  unreasonable;  outrageous;  wicked
 thoughtlessness;  indiscretion
 unaltered;  unedited;  unamended;  uncensored;  unexpurgated
 untitled;  titleless;  without a title;  no subject (email)
 indefinite;  unlimited;  life imprisonment
 nonpoisonous;  nontoxic;  harmless
 meaningless;  insignificance
 incompetence;  inability;  disability;  incapacity
 unpaid;  without pay;  gratuitous;  voluntary
 irreligion;  lack of religion;  unbelief
 Spanish Armada;  invincible armada
 neutral colour;  neutral color;  achromatic (colour, color)
 in earnest;  single-minded;  with intense concentration;  one and only;  unique
 pesticide-free;  non-chemical;  organic
 lacking a role;  lacking a post;  lacking a position;  duty-free;  tax-free
 homelessness;  homeless person;  being removed from the family register (Edo period)
 weightlessness;  zero gravity
 anaerosis;  lack of breathing;  sleep apnea;  respiratory arrest;  respiratory standstill
 numerical inferiority;  being outnumbered
 uneducated;  uncultured;  unrefined;  ignorant
 (earning or paying) no interest
 free-to-play;  without paying
 unapproved;  lack of approval
 without oxygen;  anaerobic;  anoxia;  hypoxia
 not in the family register;  lacking a family register
 unqualified;  unlicensed;  uncertified
 recoilless rifle;  recoilless gun
 having nothing;  being free of earthly attachments
 having nothing;  being free of earthly attachments
 uncrowned;  without rank;  having no championship wins;  receiving no (major) awards
 scoreless (game or competition)
 lacking talent or ability
 without warning or notice
 wind egg;  unfertilized egg;  unfertilised egg
 limitless;  apolar;  limitlessness of taiji
 lack of religion;  irreligion;  atheism
 not taking an examination;  not having to take an examination
 non-anger;  non-hatred;  no-enmity
 without money;  no need for money
 never being late (for school, work, etc.);  always being on time
 lack of reflection (on one's conduct, failures, etc.);  lack of self-examination;  lack of introspection
 charge-free;  free of charge
 all-encompassing;  unqualified (e.g. opinion)
 ignorant and illiterate;  uneducated and illiterate;  uneducated and illiterate person
 pre-washed rice;  wash-free rice;  musenmai
 non-denominational;  churchless
 being out of office;  lacking a title
 unselfish;  disinterested;  unavaricious;  free of avarice
 having no income;  state of nonattachment;  lack of attachment;  not seeking anything
 immediacy (in philosophy);  directness
 nonexistence or existence;  absence or presence
 lacking fixed principles;  inconsistent;  fickle
 village lacking a doctor;  doctorless village
 Nondenominationalism (a Japanese Christian group)
 thoughtless;  heedless;  rash
 without missing (a day of) work
 noninterference;  nonintervention
 lacking talent;  lacking accomplishments
 irreligion;  unbelief;  atheism;  atheist
 without notice;  without leave (e.g. absence);  unregistered;  unreported (e.g. marriage, business, etc.)
 lacking a registered domicile
 unpatterned (e.g. clothes, pottery);  unfigured;  plain
 without an audience;  crowdless;  behind closed doors
 nullification;  annihilation
 subclinical;  asymptomatic;  without symptoms
 not having a plan;  aimlessness;  having no definite plan
 asexuality (lack of sexual attraction to others);  non-sexual love
 (earning or paying) no interest
 amenorrhea (absence of menstruation);  amenorrhoea
 non-volitional;  involuntary;  spontaneous;  unintentional
 unscented;  non-scented;  fragrance-free;  unflavoured
 consistency (of an axiomatic system)
 without notice;  without leave (e.g. absence);  unregistered;  unreported (e.g. marriage, business, etc.)
 (in Japan) 12th note of the ancient chromatic scale (approx. C sharp)
 not knowing one's bearings;  being disorientated;  itinerant monk;  pilgrim
 the one-character reply ("no") offered by Zhaozhou to the question "Does a dog have Buddha nature?"
 unpolluted;  non-polluting
 infinite;  incumbent member (or candidate) unaffiliated with a party
 belonging to no (political) faction
 not submitted to the selecting committee
 having no wife;  being single;  being unmarried;  unmarried man
 no artificial coloring added (foods, drinks, etc.)
 dimensionless number;  dimensionless quantity
 Uninterruptible Power Supply;  UPS
 reckless;  thoughtless;  rash;  ill-advised;  impulsive;  mad (e.g. scheme)
 Mushikikai;  formless realm;  world free of greed or matter
 unexamined;  untested;  unscreened
 lacking a portfolio (of a minister of state, etc.)
 salt free;  no-salt;  raw fish;  fresh fish;  purity;  naive person
 omni-directional (microphone, etc.);  nondirectional
 illiterate and ignorant;  uneducated and lacking in wisdom and discernment
 immaculacy (i.e. freedom from original sin);  immaculateness
 lacking opposition or competition
 the "three noes principle" of no drive, no interest, and no sense of responsibility;  principle of indolence, indifference, and irresponsibility
 calm belt (e.g. doldrums)
 dull lustre;  dull luster;  matt (appearance)
 lack of a warranty (products, etc.);  lack of security (e.g. loan)
 uninterruptible power supply;  UPS
 belonging to no party or school of thought
 kanji without kanbun assistance markings;  poetry, haiku, etc. without comments or corrections;  meaningless;  incomprehensible
 (in Japan) 5th note of the ancient chromatic scale (approx. F sharp)
 unreasonable and unjust;  unconscionable
 lack of boundary;  borderless (psych.);  confluence (psych.)
 (haiku) lacking seasonal references
 unbiasedness;  objectivity
 clean room (e.g. in semiconductor manufacturing);  cleanroom
 non-craving;  non-coveting
 Anura;  order comprising the frogs and toads
 non-conversion;  nonconversion
 (being) free of chemical seasoning (esp. MSG)
 without fault;  without mistakes;  no-fault;  impeccability
 lack of rainfall;  drought
 pre-literate society;  non-literate society
 pure soy milk;  unprocessed soy milk;  untreated soy milk
 intangible;  incorporeal;  by force;  outrageous;  making light of;  making fun of
 low-status samurai without land;  low-status farmer without land
 (fully) automated factory
 ASCII data transfer with XON-XOFF flow control
 silent time;  silence period
 anhydrous alcohol;  absolute alcohol
 impunitive;  not tending to blame others
 unspecified bit rate;  UBR
 impunitive;  not tending to blame others
 caecilian (any burrowing legless amphibian of the order Gymnophiona)
 tailless airplane;  tail-less airplane
 (riding or entering) without a ticket
 unrecognized;  unrecognised;  lack of recognition
 continuously variable transmission;  CVT
 change toward a borderless world;  development of a borderless world
 no-par stock;  no-par-value stock
 anurans (tailless amphibians)
 acid-free paper;  archival paper
 agnathans (jawless fishes of superclass Agnatha)
 imperative statement;  unconditional statement
 no-par stock;  no-par-value stock
 tailless aircraft;  tail-less airplane
 zero article;  having no article
 no-fault liability principle
 non-store type (retailing, business, etc.)
 inductive charging;  wireless charging
 no operation instruction;  no op
 additional tax charged for not filing one's return on time
 Lecanorchis japonica (species of saprophytic orchid)
 pollen-free Japanese cedar (Cryptomeria japonica)
 pollen-free Japanese cedar (Cryptomeria japonica)