atonal
US /ˌeɪˈtoʊ.nəl/
UK /ˌeɪˈtoʊ.nəl/

1.
atonal
not written in any key or mode; lacking tonality.
:
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Schoenberg's early works were revolutionary for their atonal compositions.
As primeiras obras de Schoenberg foram revolucionárias por suas composições atonais.
•
The modern piece of music was entirely atonal, challenging the audience's traditional expectations.
A peça musical moderna era inteiramente atonal, desafiando as expectativas tradicionais do público.