In tennis, you'd call this an unforced error.
Source: tatoeba (817527)
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In tennis, you'd call this an unforced error.
Source: tatoeba (817527)
Her cheeks were a little flushed and her eyes very bright, but her smile was quite natural and unforced.
Source: tatoeba (11612017)
Obata is ranked 39th in the world and was top-seeded for the first time in a WTA Tour event, but she committed too many unforced errors against an opponent who was familiar with her game.
Source: tatoeba (12283436)