Entry 2 senses Webster, 1913 Willful /wĭl'-fəl/ · Will·ful · IPA /wˈɪlfəl/ 01 a. Of set purpose; self-determined; voluntary; as, willful murder. 1. Of set purpose; self-determined; voluntary; as, willful murder. “In willful poverty chose to lead his life.” — Chaucer. “Thou to me Art all things under heaven, all places thou, Who, for my willful crime, art banished hence.” — Milton. 2. Governed by the will without yielding to reason; obstinate; perverse; inflexible; stubborn; refractory; as, a willful man or horse.