noun
a person or thing that is the direct opposite of someone or something else
adjective
directly opposed or contrasted; opposite
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The antithesis of good is not evil, but rather indifference.
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Her love for action movies is the antithesis of her sister's preference for romantic comedies.
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His style is the complete antithesis of what's trending right now.
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The calmness of the lake was the antithesis of the storm raging inside her.