快適

快適

Comfortable; pleasant.

In this sentence, 快適 (comfortable) is modifying the noun 靴 (shoes) to describe the quality of the shoes.

快適な靴を探しています。

I am searching for comfortable shoes.

Here, 快適 (comfortable) describes the state of the room being enjoyable and pleasant for use.

この部屋はとても快適です。

This room is very comfortable.

快適 (comfortable) is used adverbially here, describing the manner of spending time.

快適に過ごすためには、良い家具が必要です。

To live comfortably, good furniture is necessary.