That information is unnecessary.

That information is completely unnecessary.

He thinks that war is a necessary evil.

His nature is very kind.

Detailed information is needed to understand the nature of that project.

I was moved by his sincerity.

His nature is very kind.

Fundamental interaction is one of the most important forces in physics.

He is good at writing school essays about his impressions of a book.

Natural language understanding is an important field of artificial intelligence.