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Definition of fishy : 1. Consisting of fish; fishlike; having the qualities or taste of fish; abounding in fish.
2. Extravagant, like some stories about catching fish; improbable; also, rank or foul.

Synonyms:

odd, singular, leery, doubtful, mirthful, rummy, comical, untrusting, laughable, uncertain, amusing, rum, curious, fly-by-night, equivocal, questionable, peculiar, honest, shadowy, funny, risible, queer, shadowed, comic, mistrustful, louche, shady, suspect, wary, umbrageous, suspicious

bird-like, animalistic, vertebral, feline, ruminating, mammalian, bestial, reptilian, canine, amphibious, wild

implausible, dubious, unlikely

Usage examples:

• A curious glitter leaped into his fishy eyes. - "A Fool and His Money", George Barr McCutcheon.
• But I found that Springfield had suggested to the General that my loss of memory was very fishy- a mere blind in fact to cover up a very suspicious past. - ""The Pomp of Yesterday"", Joseph Hocking.
• Now that Teddy saw them quite close they were uglier than ever, with goggle eyes, and rough, fishy- looking skins. - "The Counterpane Fairy", Katharine Pyle.