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antagonistic

[an-tag-uh-nis-tik]
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adjective
  1. acting in opposition; opposing, especially mutually.
  2. hostile; unfriendly.
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Origin of antagonistic

First recorded in 1625–35; antagonist + -ic
Related formsan·tag·o·nis·ti·cal·ly, adverbnon·an·tag·o·nis·tic, adjectivenon·an·tag·o·nis·ti·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

inimicalunfriendlycombativehostile

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British Dictionary definitions for antagonistic

antagonistic

adjective
  1. in active opposition
  2. mutually opposed
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Derived Formsantagonistically, adverb
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 antagonistic

adj.

1630s, from antagonist + -ic. Related: Antagonistical (1620s); antagonistically.

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Online Etymology Dictionary, © 2010 Douglas Harper