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). General sense of "characterized by direct opposition" is from 1848. Related: Antithetically.

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Definitions of antithetical

antithetical (adj.)
sharply contrasted in character or purpose;
practices entirely antithetical to her professed beliefs
Synonyms: antithetic
From wordnet.princeton.edu