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Onlooker vs Undefined - What's the difference?

onlooker | undefined |

As a noun onlooker

is a spectator; someone looks on or watches, without becoming involved or participating.

As an adjective undefined is

lacking a definition or value.

onlooker

English

Noun

(en noun)
  • A spectator; someone looks on or watches, without becoming involved or participating.
    • I wasn’t in the fight, I was only an onlooker .

    Synonyms

    * bystander

    Anagrams

    *

    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