In Belgium, more specified in Leuven, we use the word "fishy" when we don't trust a case.

Eg. the case of "Lernout and Hauspie" : that company grow too fast and had too excellent results, it was a fishy case.

A good synonim for "fishy" could be suspicous. Or you can also say that "there is a smell on that case."

Fish"y (?), a.

1.

Consisting of fish; fishlike; having the qualities or taste of fish; abounding in fish.

Pope.

2.

Extravagant, like some stories about catching fish; improbable; also, rank or foul.

[Colloq.] <--3. creating suspicion that the surface appearances are misleading -->

 

© Webster 1913.

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