1. most suspicious or questionable
Usage: informal
2. having the strongest smell or taste of fish

Examples

• That’s the fishiest excuse I’ve ever heard.
• Something fishy is going on here, and this is the fishiest part of the whole story.
• The fishiest smell came from the old seafood market.
• Of all the restaurants we visited, this one served the fishiest salmon.
• His alibi was the fishiest thing about the entire case.
• The fishiest part of the deal was the unusually low price.