antithetical
/ˌæntɪˈθɛtɪkəl/ adjective C2- Pertaining to antithesis, or opposition of words and sentiments; containing, or of the nature of, antithesis; contrasted. · His wrong-headed beliefs are antithetical to everything we stand for as a community.· This is precisely why insistence on relative truth is antithetical to critical thinking.
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