Definition of "unintentionally"
adverb
comparative more unintentionally, superlative most unintentionally
In an unintentional manner; not intentionally.
Quotations
"Oh, no! Mason will not defy me; nor knowing it, will he hurt me—but, unintentionally, he might in a moment, by one careless word, deprive me, if not of life, yet for ever of happiness."
1847, Charlotte Brontë, chapter V, in Jane Eyre, 1st edition, volume II, page 132