Etymology
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willfully (adv.)

also wilfully, late Old English wilfullice "of one's own free will, voluntarily;" see willful + -ly (2). Mid-14c. as "deliberately, knowingly." Bad sense of "on purpose" is attested from late 14c.

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Definitions of willfully

willfully (adv.)
in a willful manner;
she had willfully deceived me
Synonyms: wilfully
From wordnet.princeton.edu