adjective
a word or phrase that describes or modifies a noun or pronoun, in this case, antithetical describes something that is in opposition or contrast to something else
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The concept of individualism is often seen as antithetical to collectivism.
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Some people believe that cats and dogs are antithetical pets.
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His love for spicy food is antithetical to his friend's preference for bland dishes.
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The politician's actions were antithetical to the values he claimed to uphold.