Adverbial accidentally has 3 senses
  1. by chance, accidentally, circumstantially, unexpectedly - without advance planning; "they met accidentally"
    Antonyms: intentionally, deliberately, designedly, on purpose, purposely, advisedly, by choice, by design
    Derived from adjective accidental2
  2. incidentally, accidentally, by chance - in an incidental manner; "these magnificent achievements were only incidentally influenced by Oriental models"
  3. unintentionally, accidentally - without intention; in an unintentional manner; "she hit him unintentionally"
    Antonyms: intentionally, deliberately, designedly, on purpose, purposely, advisedly, by choice, by design
    Derived from adjective accidental3
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