easy-peasy; easy; simple
pleasant; comfortable; comfy
今日のテスト、楽ちんだったね！
Today's test was easy-peasy, wasn't it!
この楽ちんなサンダルなら、どこへでも行けそう。
With these comfy sandals, I feel like I could go anywhere.
忙しい毎日から解放されて、楽ちんに過ごしたい。
I want to be freed from busy days and live comfortably and easily.