凹凸不平

Concave; depressed or sunken inward; a pass or valley; variant pronunciation for 'wa'.

To stick out; protruding; convex; bulging; the opposite of concave; also used for male connectors.

Function word; no; not; un-; negative prefix; used to form questions or emphasize a statement; sometimes used for rhythm.

Flat; level; even; calm; peaceful; to tie or draw (in a score); surname.