headstrong vs willful

headstrong and willful both are adjectives.

Word	Noun	Adjective	Verb	Adverb
headstrong	No	Yes	No	No
willful	No	Yes	No	No

As adjectives, headstrong and willful are synonyms defined as:

headstrong and willful: habitually disposed to disobedience and opposition

Other synonyms of headstrong include froward, self-willed, wilful.

headstrong (adjective)	willful (adjective)
habitually disposed to disobedience and opposition	habitually disposed to disobedience and opposition
	done by design