1(in sport, especially tennis) a mistake in play that is attributed to one's own failure rather than to the skill or effort of one's opponent.
- ‘she made 88 unforced errors, including a double fault on match point’
- 1.1A careless or foolish mistake.
- ‘how can he portray himself as a leader-in-waiting when he makes that sort of unforced error?’
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