IPA: /ˌsɛntəˈmɛnəlist/
KK: /sɛntəˈmɛnəlist/
A person who has strong feelings of tenderness, sadness, or nostalgia, often valuing emotions over logic.
As a sentimentalist, she often reminisced about her childhood with great emotion.
Sentimentalist → It is formed from "sentiment" (from French *sentiment*, meaning feeling or emotion) and "-alist" (meaning one who practices or advocates). The word "sentimentalist" refers to a person who is guided by or emphasizes feelings and emotions.
Think of someone who is deeply in touch with their 'feelings' ('sentiment') and is an 'advocate' ('-alist') for those emotions.