expressing yourself in a way that is not clear

He was confused and incoherent and I didn't get much sense out of him. 他说话颠三倒四，语无伦次，我听不大懂他在说些什么。

expressed in a way that is not clear, especially with ideas or words that are not connected in a sensible or clear way

The talk she gave was incoherent and badly prepared. 她的讲话条理不清，准备很不充分。