Antonyms of adj willful

2 senses of willful

Sense 1
willful, wilful -- (done by design; "the insult was intentional"; "willful disobedience")

INDIRECT (VIA voluntary) -> involuntary, nonvoluntary, unvoluntary -- (not subject to the control of the will; "involuntary manslaughter"; "involuntary servitude"; "an involuntary shudder"; "It (becoming a hero) was involuntary. They sank my boat"- John F.Kennedy)

Sense 2
froward, headstrong, self-willed, willful, wilful -- (habitually disposed to disobedience and opposition)

INDIRECT (VIA disobedient) -> obedient -- (dutifully complying with the commands or instructions of those in authority; "an obedient soldier"; "obedient children"; "a little man obedient to his wife"; "the obedient colonies...are heavily taxed; the refractory remain unburdened"- Edmund Burke)

Similarity of adj willful

2 senses of willful

Sense 1
willful, wilful -- (done by design; "the insult was intentional"; "willful disobedience")
       => voluntary (vs. involuntary) -- (of your own free will or design; done by choice; not forced or compelled; "man is a voluntary agent"; "participation was voluntary"; "voluntary manslaughter"; "voluntary generosity in times of disaster"; "voluntary social workers"; "a voluntary confession")

Sense 2
froward, headstrong, self-willed, willful, wilful -- (habitually disposed to disobedience and opposition)
       => disobedient (vs. obedient) -- (not obeying or complying with commands of those in authority; "disobedient children")