Source : WordNet®

unconventional
     adj 1: not conforming to accepted rules or standards; "her
            unconventional dress and hair style" [ant: {conventional}]
     2: not conventional or conformist; "unconventional life styles"
        [ant: {conventional}, {conventional}]
     3: not conforming to legality, moral law, or social convention;
        "an unconventional marriage"; "improper banking practices"
        [syn: {improper}, {unlawful}]