Pleasant
Agreeable, Comfortable
noun, な adjective
Something that is both pleasant and suitable is still really pleasant.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
エアコンのある生活は快適だ。
Life with an air conditioner is pleasant.
昨日の新幹線はガラガラで、めっちゃ快適だったよ！
The bullet train yesterday was empty, and it was so comfortable!
リモートワークするのに快適な作業スペースを作りました。
I set up a comfortable workspace for remote work.
このアプリは使いやすくて、快適に作業が進められます。
This app is easy to use, so you can comfortably continue your work.