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Airhead vs Undefined - What's the difference?

airhead | undefined |

As a noun airhead

is (pejorative) a silly, foolish or unintelligent person or airhead can be a landing area for aircraft for supplying an operation, military or other, usually temporary.

As an adjective undefined is

lacking a definition or value.

airhead

English

Etymology 1

; having one's head filled with air instead of grey matter.

Noun

(en noun)
  • (pejorative) A silly, foolish or unintelligent person.
    • Synonyms
    * (silly person) bimbo, bubblehead, valley girl, dumb blonde,

    Etymology 2

    , by analogy with ''beachhead, bridgehead, railhead. ''

    Noun

    (en noun)
  • A landing area for aircraft for supplying an operation, military or other, usually temporary.
  • (military) An area of hostile territory that has been seized by paratroopers or helicopter-based troops to ensure the further landing of troops and/or materiel.
    • Related terms
    * beachhead * bridgehead * railhead

    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