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Sadness vs Undefined - What's the difference?

sadness | undefined |

As a noun sadness

is (uncountable) the state or emotion of being sad.

As an adjective undefined is

lacking a definition or value.

sadness

English

(wikipedia sadness)

Noun

  • (uncountable) The state or emotion of being sad.
  • (countable) An event in one's life that causes sadness.
    • She has experienced many sadnesses in her forty years.

    Synonyms

    * (state of being sad) forlornness, melancholy * (event causing sadness) misfortune, woe

    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