Utopian

(noun) an idealistic (but usually impractical) social reformer. Examples: "A utopian believes in the ultimate perfectibility of man."

(adj) of or pertaining to or resembling a utopia. Synonyms: utopian. Examples: "A utopian novel."

(adj) characterized by or aspiring to impracticable perfection. Synonyms: utopian (vs. dystopian). Examples: "The dim utopian future." "Utopian idealists." "Recognized the utopian nature of his hopes."