antithetic

Diametrically set against

Antithetic means directly opposed or contrasting.

Ideas, forces, or positions that are antithetic stand in sharp opposition to each other: Democracy and totalitarianism are antithetic systems.

The word appears most often in formal or academic writing.

Antithetical is the more common form.

opposition

contrary

Opposed in nature

contradictory · polar · diametric · antipodal · negating · irreconcilable · counteractive · antipathetic · opposed · opposing

contrast

juxtaposition

Adjacent contrasting placement

dissimilarity · distinction · differentiation · variance · incongruity · opposition · counterpoint · tension · dichotomy · dualism

philosophy

dialectic

Logical argument through opposition

opposition · negation · contradiction · paradox · metaphysics · logic · reasoning · dichotomy · polarity · duality

rhetoric

chiasmus

Inverted parallel construction

oxymoron · paradox · irony · contrast · counterargument · proposition · balance · symmetry · oratory · debate

Opposites
logical/conceptual relationship

antitheticidentical

Exactly the same

same · agreeing · equivalent · synonymous · analogous

compatibility

antitheticcomplementary

Mutually supplying lacks

compatible · congruous · cooperative · synergistic · harmonious

Family

antithetical, antithetically

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G