noun
A poetic or literary term for the feeling of lovesickness, often evoking a classical or romantic tone. Not an everyday clinical term.
彼は恋草に悩まされて、食事も喉を通らなかった。
He was so afflicted with lovesickness that he couldn't even eat.
万葉集には恋草を詠んだ歌が多く見られる。
Many poems in the Man'yōshū sing of lovesickness.