This discussion is completely meaningless.

His talk was completely nonsense.

His words were profound, which made me think.

He is majoring in semantics at university.

His words were profound.

His words are meaningless.

His meaningful gaze made me uneasy.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

His work is worth looking at again.

I went to the museum to look at his work again.