The novelist Edward St Aubyn has a narrator remark of the very rich that, "not having to consider affordability, their desires rambled on like unstoppable bores, relentless (持续不断的) and whimsical（反复无常的）at the same time.
If you say that a person rambles in their speech or writing, you mean they do not make much sense because they keep going off the subject in a confused way.