accidentally · adverb /ˌæk.sɪˈden.təl.i/
Word family
Nouns: accident
Adjectives: accidental
Adverbs: accidentally
accidentally
B1 by chance or by mistake
Dictionary example:
She accidentally knocked over a glass of water.
Learner example:
I accidentally broke one of your vases - the most beautiful one. (First Certificate in English; B2; Chinese)