deep;  profound;  dense;  thick;  close (relationship);  intense;  strong
 serious;  severe;  grave;  acute
 very interesting;  of great interest
 to deepen;  to heighten;  to intensify
 to deepen;  to heighten;  to intensify
 profound;  deep;  deep (of a cave, etc.);  innermost;  interior
 attentive;  cautious;  careful;  watchful
 with profound (often hidden) meaning;  pregnant with significance;  meaningful;  suggestive;  interesting
 careful;  cautious;  wary;  watchful;  vigilant;  prudent
 getting deeply involved;  going deeply into;  going too far (into something)
 deep sea;  depths of the sea;  ocean depths
 compassionate;  merciful;  benevolent;  charitable;  humane
 deepest part;  deepest portion;  depths (of the ocean etc.);  innermost
 vindictive;  tenacious;  persistent;  spiteful;  vengeful
 prudent;  thoughtful;  discreet
 chasing too far;  pursuing relentlessly
 doubting;  distrustful;  incredulous;  suspicious
 deeply religious;  devout;  godly;  faithful
 profound;  deep;  unfathomable
 to sustain a serious wound
 close connection;  deep involvement;  close relationship
 to pull over one's eyes (e.g. hat);  to wear pulled down over one's eyes
 finely chiseled (features)
 reading too much into (what ... says)
 extremely familiar;  very well-acquainted
 to develop a relationship;  to build intimacy;  to deepen a friendship;  to get acquainted
 mountain recess;  deep in the mountains
 to pull over one's eyes (e.g. hat);  to wear pulled down over one's eyes
 esoteric doctrines;  mysteries
 deeply impressive;  memorable;  striking
 doubting;  distrustful;  incredulous;  suspicious
 deep psyche;  unconscious mind;  depth psychology
 hairy;  thickly haired;  shaggy
 to cultivate a better understanding
 deep affection;  devotion;  profound attachment
 enlightening;  deep;  meaningful;  profound;  subtle;  rich in nuance
 severe wound;  serious wound;  gash
 closeted maiden;  carefully-raised girl from a well-to-do family
 discreet;  modest;  cautious
 well-versed (in);  profoundly knowledgeable (about);  high in the attainment (of)
 deep-seated;  deep-rooted;  ingrained
 becoming more serious or severe;  aggravation;  intensification
 thoughtful;  deep-thinking
 (wearing) low over one's eyes
 situated deep in the mountains
 middle of the night;  dead of night;  midnight
 deep dish;  dish with a high rim;  tureen
 greedy;  avaricious;  covetous
 snowy;  covered in deep snow
 deep;  profound;  complicated;  advanced;  impenetrable
 severe wound;  serious wound;  gash
 extremely familiar;  very well-acquainted
 deeply meaningful;  profound;  rich (in meaning)
 to get late;  to advance;  to wear on
 with profound (often hidden) meaning;  pregnant with significance;  meaningful;  suggestive;  interesting
 tender-hearted;  compassionate;  charitable;  good-hearted
 broad-minded;  (of a rikishi) tall, with long reach, making it harder for their opponent to get a grip on their mawashi
 kind-hearted;  compassionate;  charitable
 far sight and deep design
 silent (esp. of the passing of the night);  piercing (cold)
 silent;  still;  quiet;  hushed
 elegant;  charming;  refined;  enchanting;  tasteful
 digging deeply (below the surface);  mining deep;  probing deeply (issue, problem);  investigating thoroughly;  deepening relations
 late-night show;  midnight broadcast
 deliberate;  careful;  thoughtful;  thoughtfulness;  prudence
 cutting a fingernail (or toenail) to the quick;  cutting a nail too close;  deep-set nail;  deep-set part of nail
 tender-hearted;  compassionate;  charitable;  good-hearted
 deep design and forethought;  a farsighted and deeply-laid plan
 calm;  composed;  collected;  silently (of the passing of the night);  quietly
 deliberate;  careful;  thoughtful;  deeply laid plan
 doubting;  distrustful;  incredulous;  suspicious
 profound;  careful;  mature
 loitering at night (between 11pm and 4am);  late-night prowling
 depth;  shade (of color, colour)
 kind;  gentle;  considerate;  generous;  friendly;  nice
 (staying) up late at night
 deep appreciation or gratitude;  sincere apology
 deep affection;  excessive love
 dark blue;  deep blue;  navy blue
 deep ocean water;  deep-sea water
 (wearing) low over one's eyes
 to be brought up with tenderest care in a good family
 extremely deep (i.e. profound)
 attentively;  cautiously;  carefully;  watchfully;  with caution
 deep learning;  deep machine learning
 Welsh onion (species of scallion, Allium fistulosum)
 deep vein thrombosis;  DVT
 deep autumn (when the autumn has reached its climax)
 deep autumn (when the autumn has reached its climax)
 unjustly suspicious (about many things)
 deep design and forethought;  farsighted and deeply-laid plan
 deep plowing;  deep ploughing
 depth of field (photography)
 deep sadness;  great worry
 bathyesthesia;  deep sensibility
 dark blue;  deep blue;  navy blue
 (wearing) low over one's eyes
 type of conical hat that covers the whole head (used by Komuso monks)
 silent (esp. of the passing of the night);  piercing (cold)
 with profound (often hidden) meaning;  pregnant with significance;  meaningful;  suggestive;  interesting
 intrusive igneous rock;  plutonic rock
 late at night;  small hours of the morning
 Miyama cherry (Prunus maximowiczii);  Korean cherry; (arch.)  mountain cherry tree
 yellow-throated bunting (Emberiza elegans)
 midnight express (train, bus)
 abyssal plain (2,200-5,500m)
 peak of spring;  height of spring
 deep earthquake;  deep-focus earthquake
 fukagawa-meshi;  rice cooked with clams
 deep drawing (metalworking)
 enlightening;  deep;  meaningful;  profound;  subtle;  rich in nuance
 discreet;  modest;  cautious
 loitering at night (between 11pm and 4am);  late-night prowling
 Miyama stag beetle (Lucanus maculifemoratus)
 rook (species of crow, Corvus frugilegus)
 rook (species of crow, Corvus frugilegus)
 European goldenrod (Solidago virgaurea);  woundwort
 fukagawa-meshi;  rice cooked with clams
 Wright viburnum;  viburnum wrightii
 meadow buttercup (Ranunculus acris var. nipponicus)
 deep water (depth: 2000-4000 meters)
 like looking out on an abyss;  like standing on the edge of an abyss
 close classification system;  depth classification system
 nine shallow, one deep (ancient Chinese sexual technique)
 crouched walk treading on hands for stealth used by ninja
 deepest snow;  maximum snowfall;  maximum depth of snow cover
 deep brain stimulation;  DBS
 rice bowl with clams and miso broth
 hadal zone;  hadopelagic zone;  trench zone
 deep geological disposal (of radioactive waste)
(lit.) our debt to our parents is higher than the mountain and deeper than the sea
 subzero treatment;  deep cooling;  sub-zero cooling;  sub-zero treatment
 deeply;  intimately;  heartily;  sincerely;  profoundly
 bathyal zone;  midnight zone;  bathypelagic
 Calopteryx cornelia (species of damselfly)
 Japanese skimmia (Skimmia japonica, esp. S. j. var. japonica)
 Japanese hornet (Vespa simillima, esp. subspecies Vespa simillima simillima);  yellow hornet
 Aralia glabra (species of spikenard)
 tree peony (Paeonia suffruticosa)
 cinquefoil (Potentilla matsumurae);  potentilla;  Japanese alpine perennial of the rose family
 Goodyera schlechtendaliana (species of orchid)
 Euphrasia insignis (species of eyebright)
 Thunberg's fleabane (Erigeron thunbergii)
 Polemonium caeruleum subsp. yezoense var. nipponicum (variety of Jacob's ladder)