When the absolute humidity is high, the perceived temperature also feels high.

Do you understand the necessity of this project?

That information is unnecessary.

That information is completely unnecessary.

He thinks that war is a necessary evil.

He bought a new musical instrument.

He bought a new music player.

This incubator is an essential device for protecting the lives of newborns.

The wet snow began to fall, making the roads slippery.

It's time to change the baby's diaper.