Synonyms of unintentional

Adjective

1. unintentional, unwilled, unwilling (vs. willing)

usage: without deliberate intent; "my heart with unwilled love grew warm"- George Macdonald

2. unintentional, unplanned, unwitting, unintended (vs. intended)

usage: not done with purpose or intent; "an unintended slight"; "an unintentional pun"; "the offense was unintentional"; "an unwitting mistake may be overlooked"

Definition and meaning of unintentional (Dictionary)