na-adjective, noun
Describes weather or sky that is clear and pleasant. Also used metaphorically for a serene, untroubled state of mind or atmosphere.
今日は晴朗な天気で、気持ちがいい。
Today the weather is clear and pleasant, and it feels good.
彼の晴朗な表情を見て、安心した。
Seeing his serene expression, I felt relieved.