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Ineffective vs Undefined - What's the difference?

ineffective | undefined |

As adjectives the difference between ineffective and undefined

is that ineffective is not having the desired effect; ineffectual while undefined is lacking a definition or value.

ineffective

English

Adjective

(en adjective)
  • not having the desired effect; ineffectual
  • lacking in ability; incompetent or inadequate

    • 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