adverb. ['ˌənɪnˈtɛnʃənəli, ˌənɪnˈtɛnʃnəli'] without intention; in an unintentional manner.
Rhymes with Unintentionally
Sentences with unintentionally
Bottles can melt when they are unintentionally exposed to high enough temperatures to do the trick.
An unintentionally left-over part could be cause for a major safety concern over time.