noun, noun which may take the genitive case particle 'no'
serenity; tranquility of mind
A yojijukugo describing a calm, clear, and untroubled state of mind, like a fresh breeze under a bright moon. Literary and somewhat elevated in tone.
彼の光風霽月のような人柄に、誰もが心を開いた。
Everyone opened up to his serene and open-hearted personality.
明朗闊達 emphasizes cheerfulness and broad-mindedness, while 光風霽月 focuses on a pure, untroubled serenity.
From Chinese poetry, combining 光風 (a fresh breeze after rain) and 霽月 (a clear moon after clouds), metaphorically extended to a serene mind.