凹 - concave, hollow, sunken

unevenness; roughness; ruggedness; bumpiness

hollow; cavity; dent; depression

unevenness; bumpiness; roughness; ruggedness

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

concavity

embossed paper

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

intaglio printing

to dent; to indent; to depress; to humiliate

concave lens

indentation; recessus; vallecula; concavity

odd couple; incongruous couple