noun, noun or participle which takes 'suru'
Refers to the state of being lovesick, often with physical or emotional symptoms. Can be used as a noun or with する to describe suffering from lovesickness.
See also: 恋の病 (こいのやまい)
彼は恋煩いで食欲がない。
He has no appetite because of lovesickness.
恋煩
I stayed home from school, lovesick.