noun
utopian; utopian social reformer
Refers to a person who advocates for idealistic, often impractical, social improvements. The term carries a nuance of being unrealistic or overly idealistic.
彼は空想的社会改良家として知られ、現実離れした理想を語る。
He is known as a utopian social reformer who speaks of ideals far removed from reality.
その計画は空想的社会改良家の発想に過ぎないと批判された。
The plan was criticized as nothing more than the idea of a utopian social reformer.
理想主義者 is a broader term for an idealist, while 空想的社会改良家 specifically emphasizes a focus on social reform and often carries a stronger connotation of impracticality.
夢想家 is a dreamer or visionary, but does not necessarily imply a focus on social improvement; 空想的社会改良家 is specifically about reforming society.
Compound of 空想的 (fantastical, idealistic) + 社会改良 (social reform) + 家 (person who does something). The term likely emerged in modern Japanese to describe utopian social thinkers.