Source : Webster's Revised Unabridged Dictionary (1913)

Self-willed \Self`-willed"\, a.
   Governed by one's own will; not yielding to the wishes of
   others; obstinate.

Source : WordNet®

self-willed
     adj : habitually disposed to disobedience and opposition [syn: {froward},
            {headstrong}, {willful}, {wilful}]