Antithetical Definition
 ăntĭ-thĕtĭ-kəl 
    adjective
  
 Being in diametrical opposition.
 A viewpoint that was antithetical to conventional wisdom.
 American Heritage 
Of or containing antithesis.
 Webster's New World 
Of, relating to, or marked by antithesis.
 American Heritage 
Exactly opposite.
 Webster's New World 
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.
 Wiktionary 
Origin of Antithetical
-  From Medieval Latin antitheticus from Greek antithetikos from antitithenai to oppose antithesis From American Heritage Dictionary of the English Language, 5th Edition 
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