I'm worried about the rising water of the river due to last night's heavy rain.

The river swelled due to the heavy rain last night.

Mr. Usui is my best friend.

He thinks that war is a necessary evil.

Do you understand the necessity of this project?

That information is unnecessary.

That information is completely unnecessary.

His grandfather died of senility.

I think this dish is lightly seasoned and good for health.

Usuba bocho is the ideal knife for thinly slicing vegetables.