atonal

adj. Music
Lacking a tonal center or key; characterized by atonality.

atonally a·ton'al·ly adv.

Term applied to music that is not tonal, i.e. not in a key. The term is in some circumstances avoided for music that is serial; and it is sometimes reserved for the post-tonal but pre-serial music of the Second Viennese School (Schoenberg, Berg and Webern). The term ‘pantonal’ is occasionally used in the same sense.

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Music that lacks a tonal center, or in which all pitches carry equal importance.

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The adjective has one meaning:

Meaning #1: (music) characterized by avoidance of traditional Western tonality
  Synonym: unkeyed
  Antonym: tonal (meaning #2)

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