Utopian

Part of speech: noun (n.)

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

Part of speech: adjective (a.)

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