accidentally

If something happens accidentally, it didn't happen on purpose — blame it on a mistake, chance, or outside forces.

There are things you mean to do, like brushing your hair or buttoning your shirt. Then there are things you do accidentally: you didn't mean for them to happen, but they happened anyway. Just about all spilled milk happens accidentally. If a surgeon leaves a scalpel in a patient, let's hope he did it accidentally. And if a football bounces off a defender into the running back's arms and he scores a touchdown, he made a great play — accidentally.

Definitions of accidentally
  1. adverb
    without intention; in an unintentional manner
    synonyms: unintentionally
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    Antonyms:
    advisedly, by choice, by design, deliberately, designedly, intentionally, on purpose, purposely
    with intention; in an intentional manner
  2. adverb
    without advance planning
    “they met accidentally
    synonyms: by chance, circumstantially, unexpectedly
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    Antonyms:
    advisedly, by choice, by design, deliberately, designedly, intentionally, on purpose, purposely
    with intention; in an intentional manner
  3. adverb
    of a minor or subordinate nature
    synonyms: incidentally
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