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Optimism vs Undefined - What's the difference?

optimism | undefined |

As a noun optimism

is a tendency to expect the best, or at least, a favourable outcome.

As an adjective undefined is

lacking a definition or value.

optimism

English

Noun

(en-noun) (wikipedia optimism)
  • a tendency to expect the best, or at least, a favourable outcome
    • I love her youth, her beauty and above all her optimism that everything will turn out fine.
  • the doctrine that this world is the best of all possible worlds
  • the belief that good will eventually triumph over evil

    • Antonyms

    * pessimism

    Derived terms

    * optimist

    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