accidentally (part of speech: adverb)
colloquially (part of speech: adverb)
- His subject of discourse was the prospects of the turnip " breer," but he casually explained that he was waiting for medical advice. - "Beside the Bonnie Brier Bush", Ian Maclaren.
- He found his morocco- bound photograph album awaiting him when he arrived at the Waldorf Hotel next day, and during the afternoon he took it in his hand and strolled quietly and casually into Franklin Fullaway's rooms. - "The Rayner-Slade Amalgamation", J. S. Fletcher.
- She only mentioned her intention casually- in fact, when I asked if we would meet soon. - "A Mysterious Disappearance", Gordon Holmes.