もうホントにこいつは優柔不断で、イジイジした奴だ。

This guy is really wishy-washy. He couldn't make a decision to save his life.

彼の優柔不断さにイライラした。

I was irritated by his indecision.

あいつは優柔不断だから、彼女が愛想尽かしちゃったんだよ。

She got tired of his waffling and dumped him.