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Wilfully vs Undefined - What's the difference?

wilfully | undefined |

As an adverb wilfully

is (obsolete) willingly, of one's own free will.

As an adjective undefined is

lacking a definition or value.

wilfully

English

Adverb

(en adverb)
  • (obsolete) Willingly, of one's own free will.
  • * 1590 , Edmund Spenser, The Faerie Queene , II.vi:
    • Why then dost thou, O man, that of them all / Art Lord, and eke of nature Soueraine, / Wilfully make thy selfe a wretched thrall [...]?
  • Deliberately, on purpose; maliciously.

    • undefined

    English

    Adjective

    (wikipedia undefined) (-)
  • Lacking a definition or value.
  • (mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
    • The result of division by zero is undefined .

    Antonyms

    * defined