atonalist

noun

aton·​al·​ist (ˌ)ā-ˈtō-nə-list  (ˌ)a- 

plural -s

: one who advocates or practices atonalism

atonalistic

(ˌ)ā-ˌtō-nə-ˈli-stik, 

(ˌ)a-

adjective

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