Etymology
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garish (adj.)

"showy, dazzling," especially "glaringly vulgar and gaudy," 1540s, of unknown origin, possibly from obsolete Middle English gawren "to stare" (c. 1200), which is of uncertain origin (perhaps from Old Norse gaurr "rough fellow") + -ish. Related: Garishly; garishness.

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Definitions of garish

garish (adj.)
tastelessly showy;
garish colors
From wordnet.princeton.edu