accidentally
ak-si-DEN-tuh-lee/ˌæk.sɪˈdɛnt(ə)li/
- 1Without meaning to, by mistake instead of on purpose.
Like stepping on someone's foot in a crowd without meaning to.
She accidentally deleted the file while cleaning up her folders.
He knocked the glass over accidentally and apologized at once.
Similarinadvertently, unintentionally, mistakenly, unwittingly
Oppositedeliberately, intentionally, purposely, knowingly
- 2By chance, when no one planned for it to happen.
Like running into an old friend you never expected to see.
They accidentally met at the train station after years apart.
I accidentally found my old photos while looking for something else.
Similarfortuitously, casually
Oppositedeliberately, intentionally, purposely
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Origin
From the word "accidental" plus the ending "-ly".