Etymology
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antithetical (adj.)

"of the nature of or containing a (rhetorical) antithesis," 1580s, from Greek antithetikos "setting in opposition," from antithetos "placed in opposition," from antithesis "opposition, resistance," literally "a placing against" (see antithesis) + -al (1). The general sense of "characterized by direct opposition" is attested by 1848. Related: Antithetically.

updated on September 23, 2022

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Definitions of antithetical from WordNet

antithetical (adj.)
sharply contrasted in character or purpose;
practices entirely antithetical to her professed beliefs
Synonyms: antithetic
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.