This discussion is completely meaningless.

His talk was completely nonsense.

We discussed the issue.

We started a discussion about an important 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.

In mathematics, a perfect number refers to a number where the sum of its divisors, excluding the number itself, equals the number.