Utopian

1. (a.) Of or pertaining to Utopia; resembling Utopia; hence, ideal; chimerical; fanciful; founded upon, or involving, imaginary perfections; as, Utopian projects; Utopian happiness.

2. (n.) An inhabitant of Utopia; hence, one who believes in the perfectibility of human society; a visionary; an idealist; an optimist.

Thesaurus Entries

Don Quixote, Quixote, Utopian, daydreamer, dreamer of dreams, enthusiast, escapist, idealist, idealizer, illusionist, lotus-eater, prophet, rhapsodist, romancer, romantic, romanticist, seer, theorist, utopian, utopianist, utopianizer, visionary, wishful thinker