"utopian" in the noun sense
1. Utopian
an idealistic (but usually impractical) social reformer
"a Utopian believes in the ultimate perfectibility of man"
"utopian" in the adjective sense
1. utopian, Utopian
of or pertaining to or resembling a utopia
"a Utopian novel"
2. utopian
characterized by or aspiring to impracticable perfection
"the dim utopian future"
"utopian idealists"
"recognized the utopian nature of his hopes"
Source: WordNet® (An amazing lexical database of English)
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