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Synonyms for Wilful (same or very similar meaning)

WordNet sense 1 (done by design):
intentional, willful

WordNet sense 2 (of your own free will or design; not forced or compelled):

WordNet sense 3 (habitually disposed to disobedience and opposition):
froward, headstrong, self-willed

WordNet sense 4 (not obeying or complying with commands of those in authority):

From the ODE community, based on WordNetadd/edit