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Heelies vs Undefined - What's the difference?

heelies | undefined |

As a noun heelies

is trainers with one or more wheel fitted to the heel thus allowing the wearer to walk normally then skate by shifting the weight to the rear.

As an adjective undefined is

lacking a definition or value.

heelies

English

Noun

(en-plural noun)
  • trainers with one or more wheel fitted to the heel thus allowing the wearer to walk normally then skate by shifting the weight to the rear

    • Usage notes

    * Heelys, the original, are a branded version

    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