Definition of antithetical
1
: being in direct and unequivocal opposition : directly opposite or opposed
… some see the idea of a museum for rock & roll as antithetical to the music's rebellious ethic …— Al Weisel
2
: constituting or marked by antithesis
antithetical conflict
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Merriam-Webster unabridged
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Time Traveler for antithetical
The first known use of antithetical was in 1583
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