Source : WordNet®

unintentional
     adj 1: not done or made or performed with purpose or intent [syn: {undesigned}]
            [ant: {designed}]
     2: without deliberate intent; "my heart with unwilled love grew
        warm"- George Macdonald [syn: {unwilled}]
     3: not intentional; "an unintended slight"; "an unintentional
        pun"; "the offense was unintentional"; "an unwitting
        mistake may be overlooked" [syn: {unplanned}, {unwitting}]