fishy
1 (informal) cock-and-bull (informal) dodgy (Brit., Austral., & N.Z. informal) doubtful, dubious, funny (informal) implausible, improbable, odd, queer, questionable, rum (Brit. slang) suspect, suspicious, unlikely
2 blank, deadpan, dull, expressionless, glassy, glassy-eyed, inexpressive, lacklustre, lifeless, vacant, wooden
3 fishlike, piscatorial, piscatory, piscine