In a manner that is accidental or happens by chance; unintentionally or by accident.
From 'accidentary' + adverb suffix '-ly,' based on Latin 'accidentalis' (accidental). An archaic or literary adverbial form indicating unintentional action.
This word is so wonderfully archaic and formal that saying 'I accidentally dropped it' sounds casual compared to 'I accidentarily knocked the vase to the floor.' It adds a layer of formal regret!
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