adverb

diametrically

diametrically

Their views are diametrically opposed.

Their views are diametrically opposed.

((adjective/adverb)) used to modify an adjective or adverb, meaning 'completely' or 'in direct opposition'. Their views are diametrically opposed.

Synonyms: completely, directly, absolutely; Antonyms: partially, slightly

From Greek 'diametros' (dia- 'across' + metron 'measure'), referring to the diameter of a circle connecting two opposite points.

Imagine a diameter cutting a circle into two completely opposite halves.

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