adv ·Uncommon ·Advanced level

Definitions

Adverb

1. 1
   Wrongly; erroneously. not-comparable

   "I mistakenly assumed that the shop was still there."

2. 2
   By accident; by mistake; in error (without intention to do so). not-comparable

   "Today I mistakenly took your packed lunch to work."

Adverb

1. 1
   in a mistaken or erroneous manner wordnet

Synonyms

All synonyms

amissastrayby mistakeerroneouslyerroneouslyerror

Example

More examples

"I've mistakenly deleted the party information and registration you sent to me."

Etymology

From mistaken + -ly.

Related phrases

by accidentby mistakein error

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.