Answer:

fishy

Answer	Crossword Clue
FISHY	Questionable
FISHY	Hard to swallow
FISHY	Dubious

FISHY	Suspicious
FISHY	Unconvincing
FISHY	Unbelievable
FISHY	Not on the up and up
FISHY	Pretty suspicious
FISHY	Unbelievable: colloq.
FISHY	Improbably: Colloq.
FISHY	Suspicious: Colloq.

FISHY	Suspect
FISHY	Like a tale of "the one that got away"
FISHY	Not quite right
FISHY	A bit questionable
FISHY	Like some hole-in-one claims