Related formsa·ton·al·is·tic, adjectivea·ton·al·ly, adverb
Examples from the Web for atonal
American Idol's eccentric, atonal auditioners make us laugh—and then we never see them again.
Another time, when they booed an atonal piece, he repeated it immediately.The World's Great Men of Music|Harriette Brower
The voice was talking a language I didn't understand at all that went up and down the scale like atonal music.The Night of the Long Knives|Fritz Reuter Leiber