Cantillating refers to singing or chanting in a melodious way. The antonyms of cantillating can vary depending on the context, but some possibilities include speaking, reciting, muttering, whispering, or shouting. These words suggest a different style of delivering a message, such as in a straightforward manner or with less regard for musicality. Another antonym could be silence, indicating a lack of vocalization altogether. However, these words do not convey the same sense of beauty and artistry as cantillating does, so the choice of antonym may depend on the desired effect of the message being conveyed.