Wiktionary
a. 1 foolish, silly 2 trifling
WordNet
adj. pungent adjectives of disesteem; "gave me a cockamamie reason for not going"; "wore a goofy hat"; "a silly idea"; "some wacky plan for selling more books" [syn: cockamamie, goofy, sappy, silly, wacky, whacky, zany, unreasonable]
Usage examples of "cockamamy".
She had had Nells Borson of the Cockamamies, all of the Hindenburgh Seven and what she needed, really needed, all she needed, was Maggot.
It was then I learned that what I’d thought were cockamamy turquoise stones set in her headband and bracelets were really raw emeralds.
But the cockamamy judge fell for it and sent him to a supposedly secure psychiatric installation instead of a penitentiary.
If that cockamamy suit's the new American uniform, then I feel sorry for the lot of you.