adverb

accidentally

accidentally, by mistake, unintentionally

I accidentally deleted the file.

I accidentally deleted the file.

She accidentally bumped into him.

She accidentally bumped into him.

accidentally ((verb)) to do something by chance or mistake I accidentally deleted the file.

Synonyms: unintentionally, by mistake, by chance; Antonyms: intentionally, on purpose, deliberately

From 'accidental' + the adverb-forming suffix '-ly'. It describes an action done in an accidental manner.

The '-ly' ending often signals an adverb, describing *how* an action is done. This action was done in an 'accidental' way.

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