Willfully
来自Big Physics
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Middle English: from the noun will2 + -ful.
wiktionary
willful + -ly
etymonline
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.
