Fishy

Adjective

 * Of, from, or similar to fish.
 * 1) Suspicious; inspiring doubt.

Thesaurus
ambiguous, amoral, beguiling, blank, catchy, conscienceless, corrupt, corrupted, criminal, crooked, dark, deadpan, deceiving, deceptive, delusive, delusory, devious, dishonest, dishonorable, doubtable, doubtful, dubious, dubitable, eellike, empty, equivocal, evasive, expressionless, fallacious, false, felonious, fraudulent, funny, glassy, hallucinatory, ill-got, ill-gotten, illusive, illusory, immoral, impassive, implausible, improbable, indirect, inexpressive, insidious, misleading, not kosher, odd, peculiar, piscatorial, piscatory, pisciform, piscine, poker-faced, problematic, queer, questionable, rotten, selachian, shady, shameless, sharkish, shifty, sinister, slippery, strange, suspect, suspicious, trickish, tricksy, tricky, uncertain, unconscienced, unconscientious, unconscionable, underhand, underhanded, unethical, unexpressive, unlikely, unprincipled, unsavory, unscrupulous, unstraightforward, vacant, without remorse, without shame, wooden

Alternative forms

 * fishie