noun
Refers to a person who is prone to sentimentality, often used in literary or critical contexts.
彼は感傷主義者で、昔の写真を見るたびに涙ぐむ。
He is a sentimentalist and gets teary-eyed whenever he looks at old photos.
An adjective meaning 'sentimental'; 感傷主義者 is the person who exhibits this trait.
Compound of 感傷 (sentiment) + 主義 (principle, -ism) + 者 (person).