sentimental (adj.)youdaoicibaDictYouDict[sentimental 词源字典]
1749, "pertaining to or characterized by sentiment," from sentiment + -al (1). At first without pejorative connotations; meaning "having too much sentiment, apt to be swayed by prejudice" had emerged by 1793 (implied in sentimentalist). Related: Sentimentally.[sentimental etymology, sentimental origin, 英语词源]