Utopianism (Adjective) — Of or pertaining to or resembling a utopia. ex. "a Utopian novel"
Utopianism (Adjective) — Characterized by or aspiring to impracticable perfection. ex. "the dim utopian future" ex. "utopian idealists" ex. "recognized the utopian nature of his hopes"
Utopianism (Noun) — The political orientation of a Utopian who believes in impossibly idealistic schemes of social perfection.