willingly, of one's own free will

listen to the pronunciation of willingly, of one's own free will
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wilfully

Why then dost thou, O man, that of them all / Art Lord, and eke of nature Soueraine, / Wilfully make thy selfe a wretched thrall ?.

of one's own
belonging completely to yourself; "a room of one's own
of one's own
belonging to one, his, hers