IPA: //aɪˈdɪə.lɪst//
KK: /aɪˈdiːəlɪst/
A person who believes in or supports ideals, often having high hopes or visions that may not be practical.
As an idealist, she always dreamed of a world where everyone lived in harmony.
Idealist → It is formed from "idea" (from Greek "idea", meaning form or pattern) and "-ist" (meaning one who practices or is concerned with). An idealist is someone who is concerned with or practices ideals or perfect forms of thought.
Think of someone who is focused on perfect 'forms' or 'ideas' — that's what an idealist is.