adjective, fishier, fishiest.
like a fish in shape, smell, taste, or the like.
consisting of fish.
abounding in fish.
Informal. improbable, as a story; unlikely.
Informal. of questionable character; suspicious: The sudden knockout was fishy.
dull and expressionless: fishy eyes.

1540–50; fish + -y1

fishily, adverb
fishiness, noun

5. peculiar, queer, strange, suspect, dubious. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fishy (ˈfɪʃɪ)
adj , fishier, fishiest
1.  of, involving, or suggestive of fish
2.  abounding in fish
3.  informal suspicious, doubtful, or questionable: their leaving at the same time looked fishy
4.  dull and lifeless: a fishy look

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 15c., from fish + -y (2). Sense of "shady, questionable" is first recorded 1840, perhaps from the notion of "slipperiness," or of giving off a bad odor.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They are followed by a suspicious policeman who thinks there's something fishy
  about this group.
Acidic ingredients also tend to make fish taste delicate and less fishy.
Look for fish that have bright eyes, shiny skin, and a mildly fishy aroma.
Also the ability to see far away, so you can spot somebody doing something
  fishy and get him locked up.
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