cockamamy

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cock·a·ma·mie

also cock·a·ma·my  (kŏk′ə-mā′mē)
adj. Slang
1. Trifling; nearly valueless.
2. Ludicrous; nonsensical: gave me a cockamamie reason for not going.

[Probably alteration of decalcomania.]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.cockamamy - ludicrous, foolish; "gave me a cockamamie reason for not going"; "wore a goofy hat"; "a silly idea"; "some wacky plan for selling more books"
colloquialism - a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech
foolish - devoid of good sense or judgment; "foolish remarks"; "a foolish decision"