utopical
/juːˈtəʊpɪkl/ /jʊˈtəʊpɪkl/Chiefly depreciative
adjective
Expressing or founded on an unrealistic belief in the perfectibility of society; excessively idealistic; impracticable. Also (of perfection): illusory, unattainable. Now chiefly in predicative use.
Origin
Late 16th century; earliest use found in John Whitgift (d. 1604), archbishop of Canterbury. From post-classical Latin utopicus + -al.