This discussion is completely meaningless.

His talk was completely nonsense.

We started a discussion about an important issue.

We discussed the issue.

This plan was perfectly successful.

This project has been completed in its entirety.

There are many arguments arising from diverse opinions about that issue, and no conclusion has been reached.

He is a perfectionist, and his approach to work is very strict.

This programming language is said to be Turing complete.

His performance was perfect and without blemish.