unintentionally
BrE /ʌnɪnˈtɛnʃənəlɪ/ AmE /ˌʌnɪntənˈtenʃənəli/
adverb en → es
by accident; not on purpose
por error, accidentalmente, sin querer
Collocations unintentionally hurt someone's feelings
-
He unintentionally offended her.
Sin querer la ofendió.