簡単

簡単

Simple; easy.

Here, '簡単' is used as an adjective in its declarative form, describing nature or state: simple or not complex.

この問題は簡単です。

This problem is simple.

In this sentence, '簡単に' is an adverbial form derived from '簡単', modifying the verb 'できます' to indicate the manner of the action: to do in a simple way.

説明をもっと簡単にできますか？

Can you explain it more simply?

Here, '簡単' is negated using 'ではありません', indicating a descriptive statement relating to complexity.

その機械の操作は簡単ではありません。

The operation of that machine is not simple.