important;  momentous;  essential;  principal;  major
 serious;  important;  significant;  grave;  weighty
 gravity;  gravitation;  gravitational pull
 weight;  heavyweight boxer
 strict;  severe;  stringent;  rigorous;  rigid;  firm
 regarding as important;  attaching importance to;  taking a serious view of;  putting emphasis on
 double;  two-fold;  diplo-;  dipl-;  double-edged eyelid;  double eyelid
 chief vassal;  senior statesman
 load;  heavy burden;  encumbrance;  heavy freight;  heavy responsibility
 centre of gravity (center);  centroid;  barycenter;  (one's) balance
 strong pressure;  heavy pressure
 leader;  authority;  mainstay
 triple;  treble;  threefold;  three-ply;  triplicate
 (company) director;  executive;  top management;  important post;  role with heavy responsibilities
 severe (injury, handicap, etc.);  serious
 heavy labor;  heavy labour;  hard work;  hard labor (in prison);  hard labour
 important person;  strategic person;  key figure
 heavy machinery;  heavy equipment;  heavy machine gun
 thickheaded;  slow-witted;  phlegmatic;  slow (of one's movements);  sluggish
 appointing to a responsible post;  making much of
 duplication;  repetition;  overlapping;  redundancy;  restoration
 important point;  emphasis;  iteration mark;  colon (punctuation)
 ninefold;  imperial palace;  the Court
 placed one upon another;  piled up;  excellent;  splendid;  superimposition;  superposition
 very low frequency sound;  heavy bass sound;  low-register sound
 specific gravity;  relative density;  relative importance;  weight
 serious condition;  critical condition
 heavy equipment;  heavily equipped;  heavily armed;  heavily armored
 load;  loading;  weight (of a load)
 weighting (in averaging);  aggravation
 second edition;  additional printing
 important matter;  matters of weight
 attaching too much importance to;  placing disproportionate emphasis on;  making too much of
 five-storied;  quintuplicate;  fivefold
 relative weight;  lightness and heaviness;  relative importance;  gravity
 serious condition;  critical condition
 baking soda;  sodium bicarbonate
 broiled eel served over rice in a lacquered box;  broiled eel and rice served in two separate stacked boxes, with eel in top box and rice in bottom box
 multistoried;  multilayered
 (seriously and slightly) injured persons;  people with serious and minor injures
 overweight;  too heavy (burden, workload, etc.);  too severe
 serious (vital) question;  a grave issue;  a matter of grave concern
 serious or slight injury;  major and minor injuries
 important duty;  heavy responsibility;  responsible post;  reappointment
 large prize (e.g. in horse racing);  generous reward
 broiled eel served over rice in a lacquered box;  broiled eel and rice served in two separate stacked boxes, with eel in top box and rice in bottom box
 vehicle weight;  car weight
 felony;  major offence;  felon;  old offender
 weight of an (unloaded) vehicle;  dead load;  tare;  one's own weight
 deuterium;  heavy hydrogen
 double-stopping (string instr.);  double-stop;  multiphonics (e.g. wind instr.)
 heavy (esp. in oil, chemistry, etc.)
 utter villain;  atrocious fiend;  devil
 compound sentence;  sentenced formed of two independent clauses;  important cultural property;  important cultural asset
 polymerization;  polymerisation
 food packed in nest of lacquered boxes
 double marriage (in the same family);  intermarriage
 major imprisonment;  imprisonment with hard labor (hard labour)
 double heading (using two locomotives at the front of a train);  double-headed train;  doubleheader
 pleonasm;  redundancy;  tautology;  kanji compound in which the same character is repeated
 serious crime;  heavy punishment
 heavy and chemical industries
 food tray (used in the food industry)
 serious cases (of illness)
 multiple citizenship;  multiple nationality
 pork cutlet on rice in a lacquered box
 food packed in nest of lacquered boxes
 repeatedly;  over and over again;  fully (e.g. understand);  very much;  very well
 serious or slight injury;  major and minor injuries
 heavy additional tax(ation)
 indirect translation;  translation of a translation
 treasure;  invaluable person
 multi-tiered food boxes that can be carried by hand; (arch.)  female prostitute who carried multi-tiered food boxes about and peddled foodstuffs (Meiwa and Anei eras)
 pork cutlet on rice in a lacquered box
 close confinement (in one's barracks)
 Lagomorpha;  order of rabbits, hares and pikas
 bichromic acid;  dichromic acid
 baking soda;  sodium bicarbonate
 recouping one's strength for a renewed attack (on);  making another attempt with redoubled efforts
 major imprisonment;  imprisonment with hard labor (hard labour)
 multiple regression analysis
 multiple correlation coefficient
 kilogram-weight;  kilogramme-weight
 FDD;  frequency division duplex
 law of superposition;  principle of superposition
 sodium bicarbonate;  baking soda
 potassium dichromate (K2Cr2O7)
 superheavy nucleus;  ultraheavy nucleus
 solitary confinement in a dark cell without bedding (for up to one week)
 baking soda;  bicarbonate of soda