His talk was completely nonsense.

This discussion is completely meaningless.

His meaningful gaze made me uneasy.

He is majoring in semantics at university.

His words were profound, which made me think.

It was a chance encounter with him.

I was fascinated by the beauty of the ebb and flow on the beach.

I was at a loss for words at his strange behavior.

I was at a loss for words at his joke.

He is living a hikikomori lifestyle.