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Unbeliever vs Undefined - What's the difference?

unbeliever | undefined |

As a noun unbeliever

is one who does not believe, particularly in a deity (used by believers to describe other people).

As an adjective undefined is

lacking a definition or value.

unbeliever

English

Noun

(en noun)
  • One who does not believe, particularly in a deity (used by believers to describe other people)

    • Synonyms

    * infidel * non-believer * nonbeliever

    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