adjective

contentious

controversial, argumentative

Abortion is a highly contentious issue.

Abortion is a highly contentious issue.

He has a contentious personality.

He has a contentious personality.

a ((contentious)) issue/decision a controversial issue/decision It was a contentious decision to close the factory.

Synonyms: controversial, argumentative; Antonyms: agreeable, uncontroversial

From the noun 'contention' (dispute) plus the adjective-forming suffix '-ious' (full of).

Someone or something 'full of contention' is 'contentious'. The '-ious' suffix often means 'characterised by' or 'full of'.

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