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Underworld vs Undefined - What's the difference?

underworld | undefined |

As a noun underworld

is (underworld).

As an adjective undefined is

lacking a definition or value.

underworld

English

(wikipedia underworld)

Noun

(en noun)
  • That part of society that is engaged in crime or vice.
  • (mythology) The world of the dead, located underneath the world of the living; the afterlife.

    • Synonyms

    * (world of the dead) netherworld

    See also

    * Hades, Tartarus * hell * Hel, Niflheim, Niflhel * Gehenna

    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