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See more synonyms for uncool on Thesaurus.com
adjective Slang.
  1. not self-assured or relaxed: He felt very uncool, making a speech to strangers.
  2. not sophisticated or worldly-wise.
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Origin of uncool

1955–60; un-1 + cool (in the slang senses “socially adept”)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for uncool


adjective slang
  1. unsophisticated; unfashionable
  2. excitable; tense; not cool
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for uncool


1953, in hipster slang, from un- (1) "not" + slang sense of cool (adj.).

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Online Etymology Dictionary, © 2010 Douglas Harper