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Glum vs Undefined - What's the difference?

glum | undefined |

As a noun glum

is light.

As an adjective undefined is

lacking a definition or value.

glum

English

Etymology 1

From (etyl) glomen, glommen, glomben, . More at (l).

Verb

(glumm)
  • (obsolete) To look sullen; to be of a sour countenance; to be glum.
    • (Hawes)

    Noun

    (-)
  • (obsolete) sullenness
    • (Skelton)

    Etymology 2

    Probably from (etyl) . More at (l).

    Adjective

    (glummer)
  • despondent; moody; sullen
  • * Thackeray
    • I frighten people by my glum face.

    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