Open English Wordnet
Adjectives
(s)unintentional, unplanned, unwittingnot done with purpose or intent“an unintentional pun”, “the offense was unintentional”, “an unwitting mistake may be overlooked”
(s)ignorant, unknowledgeable, unknowing, unwittingunaware because of a lack of relevant information or knowledge“he was completely ignorant of the circumstances”, “an unknowledgeable assistant”, “his rudeness was unwitting”