深

late at night

serious

to deepen

depth of water

careful

depth

tender-hearted

becoming more serious or severe

attentive

to deepen

mountain

deep place

deep sea

deep

depths

deepening

depths

profound

deep crimson

depth

very interesting

deep-rooted

... or deeper

situated deep in the mountains

muddy rice field

Shenzhen University

to pull over one's eyes (e.g. hat)

(wearing) low over one's eyes

severe wound

thoughtful

thoughtful

deep in the woods

profoundly memorable

deeply religious

past redemption

sinful

depths

depth of the sea

deep or profound meaning

(underwater) depth gauge

deepest

deepest part

close friendship

profound

deeply

Shenzhen (China)

very deeply

enlightening

to sustain a serious wound

chasing too far

deep affection

kind-hearted

deep subterranean area

with profound (often hidden) meaning

deeply meaningful

abyssal plain (2,200-5,500m)

close connection

late-night television

(staying) up late at night

doubting

doubting

Aralia glabra (species of spikenard)

night work

profound

peak of spring

deep well

to cultivate a better understanding

attentively

significant

deep forest

intrusive igneous rock

with profound (and often hidden) meaning

nine shallow, one deep (ancient Chinese sexual technique)

deep autumn (when the autumn has reached its climax)

deep autumn (when the autumn has reached its climax)

the night owls

friendly

midnight express (train, bus)

deep-seated

Welsh onion (Allium fistulosum)

abyssal zone

late night opening (businesses, etc.)

tree peony (Paeonia suffruticosa)

to develop a relationship

dark blue

deep water (depth: 2000-4000 meters)

late-night broadcasting

late-night overtime

deeply sincere

deep psyche

Thunberg's fleabane (Erigeron thunbergii)

reading too much into (a statement, etc.)

Euphrasia insignis (species of eyebright)

late-night show

overnight transportation (train service, flight, etc.)

superstitious

middle of the night

tenacious

depth finder

bathyesthesia

very deep

deep earthquake

(depth) sounding

deeply impressive

depth of field (photography)

depth psychology

subzero treatment

Miyama cherry (Prunus maximowiczii)

cinquefoil (Potentilla matsumurae)

fukagawa-meshi

deep affection

loving

deep geological disposal (of radioactive waste)

prudent

deep web

grassy

gracious

still waters run deep

still waters run deep

sinful

depth of focus

greedy

greedy

deep-sea fishery

hadal zone

isobath

well-versed (in)

scholarly

heavy drinking

deep-sea fish

deep learning

deep

profound

depths (of an art, one's mind, etc.)

depth

hairy

thoughtfulness

discreet

deep space

shenyi (Chinese aristocratic robes)

deep ocean water

(very) familiar

to be brought up with tenderest care in a good family

devout

calm

depth

Polemonium caeruleum subsp. yezoense var. nipponicum (variety of Jacob's ladder)

profoundly impressive

crouched walk treading on hands for stealth used by ninja

deep appreciation