1. (adverb) by chance, accidentally, circumstantially, unexpectedly
without advance planning
Synonyms: by luck, incidentally, unintentionally, accidentally, circumstantially, perchance, by chance, unexpectedly, out of the blue, haply, minutely
Antonyms: by design, on purpose, deliberately, designedly, intentionally, advisedly, purposely, by choice
2. (adverb) incidentally, accidentally
of a minor or subordinate nature
Synonyms: incidentally, unintentionally, by the bye, by chance, accidentally, circumstantially, apropos, by the way, unexpectedly
Antonyms: designedly, by design, purposely, on purpose, by choice, deliberately, advisedly, intentionally
3. (adverb) unintentionally, accidentally
without intention; in an unintentional manner
Synonyms: by chance, unexpectedly, circumstantially, incidentally, unintentionally, accidentally
Antonyms: advisedly, by choice, by design, purposely, designedly, on purpose, intentionally, deliberately
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Synonyms for accidentally 
