adjective, fish·i·er, fish·i·est.

  1. like a fish in shape, smell, taste, or the like.
  2. consisting of fish.
  3. abounding in fish.
  4. Informal. improbable, as a story; unlikely.
  5. Informal. of questionable character; suspicious: The sudden knockout was fishy.
  6. dull and expressionless: fishy eyes.

adjective fishier or fishiest

  1. of, involving, or suggestive of fish
  2. abounding in fish
  3. informal suspicious, doubtful, or questionabletheir leaving at the same time looked fishy
  4. dull and lifelessa fishy look

late 15c., from fish (n.) + -y (2). Sense of “shady, questionable” is first recorded 1840, perhaps from the notion of “slipperiness,” or of giving off a bad odor.

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