utopian
adj.adj. describing a perfect world or society where everything is ideal. You use this to talk about plans or ideas that are wonderful but often impossible to achieve in real life.
adj. relating to or aiming for a state of social or political perfection. Often carries a connotation of being idealistic to the point of impracticality.
The architect had a utopian vision for the new city.
Many early political thinkers wrote about utopian societies where every citizen lived in total harmony and equality.
While the project began with utopian goals of universal access and zero waste, the team eventually had to make concessions to address the harsh realities of the local economy.
Can be used both attributively before a noun and predicatively after a linking verb like 'seem' or 'sound'.