a common European bird, Cuculus canorus, of the family Cuculidae, noted for its characteristic call and its brood parasitism.

any of several other birds of the family Cuculidae.

the call of the cuckoo, or an imitation of it.

Slang . a crazy, silly, or foolish person; simpleton.

to utter the call of the cuckoo or an imitation of it.

to repeat monotonously.

Slang . crazy; silly; foolish.

of, pertaining to, or like a cuckoo.

noun

crazy , eccentric , lunatic

adjective

brainsick , crazy , daft , demented , disordered , distraught , dotty , lunatic , mad , maniac , maniacal , mentally ill , moonstruck , off , touched , unbalanced , unsound , wrong , batty , clock , daffy , fool , insane , nuts , screwball , silly , wacky