凹 - concave, hollow, sunken

unevenness; roughness; ruggedness; bumpiness

hollow; cavity; dent; depression

to be dented; to be indented; to yield; to give; to sink; to collapse; to cave in

unevenness; bumpiness; roughness; ruggedness

indentation; recessus; vallecula; concavity

intaglio plate

concave angle; (a) re-entrant

when the right conditions are fulfilled, things will turn out well on their own; a sunken place will collect water

Africa Scream (film)

concave polygon; non-convex polygon

to lose heart; to be discouraged; to be dejected; to be exhausted; to be tired out

to dent; to indent; to depress; to humiliate