maverick
     adj : independent in behavior or thought; "she led a somewhat
           irregular private life"; "maverick politicians" [syn: {irregular},
            {unorthodox}]
     n 1: someone who exhibits great independence in thought and
          action [syn: {rebel}]
     2: an unbranded range animal (especially a stray calf); belongs
        to the first person who puts a brand on it
Source: WordNet® 2.0