deep, heighten, intensify, strengthen
深 centers on physical or metaphorical depth: going far down, becoming intense, or strengthening a quality. The given meanings all extend from the idea of something being deep.
深 combines 氵 (water) with 罙, a component that likely contributes the sound and the idea of depth or penetration. The water radical reinforces the sense of deep water.
Water 氵 on the left and a deep-reaching shape 罙 on the right: imagine a deep well or a profound depth that intensifies everything.
For シン, picture a deep, thin crevice in the ocean floor: thin -> シン, and the water above is deep.
deep
late at night
serious; severe; grave; acute
very interesting; of great interest
deep sea; depths of the sea; ocean depths
profound; deep
to deepen; to heighten; to intensify
muddy rice field
depths; deep level
to deepen; to heighten; to intensify
deep breath
deep place; depths
depth of water
depth
deeply emotive; moving
abyss; ravine
sinful; wicked; immoral
attentively; cautiously; carefully; watchfully; with caution
deep crimson
enlightening; deep; meaningful; profound; subtle; rich in nuance