Added 8 October 2026 mistakenly /mɪˈsteɪ.kən.li/ adverb Categories: Describing WordsRare Words adverb ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about mistakenly at Wordnik → Where our words come from → Wrongly; erroneously. I mistakenly assumed that the shop was still there. By accident; by mistake; in error (without intention to do so). Today I mistakenly took your packed lunch to work. Related Words: erroneouslyincorrectlyerrorwrongwrongfullyimproperlyinaccuratelyunjustlyinappropriatelyunjustifiablyunfairlyunreasonably Back to today's word