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

1.
atonal
not written in any key or mode; lacking tonality.
:
•
Schoenberg's early works were revolutionary for their atonal compositions.
Schönbergs frühe Werke waren revolutionär für ihre atonale Kompositionen.
•
The modern piece of music was entirely atonal, challenging the audience's traditional expectations.
Das moderne Musikstück war völlig atonal und forderte die traditionellen Erwartungen des Publikums heraus.