What term describes the act of speaking rapidly and incessantly about unimportant matters?

The term "prate" effectively captures the essence of speaking rapidly and incessantly about trivial subjects. It implies a kind of incessant chatter that lacks meaningful content, emphasizing a talkative disposition that indulges in inconsequential matters. This word connotes a sense of lightness and frivolity in conversation, indicating that the speaker is more concerned with the act of speaking itself rather than the significance of the content.

On the other hand, "chat" refers more broadly to informal conversation but does not necessarily convey the idea of excessive or meaningless talk. "Whisper" denotes speaking softly, which contrasts with the idea of speaking rapidly and incessantly. Meanwhile, "converse" is a general term for engaging in conversation and does not imply the triviality or rapidity of speech that "prate" does. Therefore, "prate" is the most accurate term for the described action.