quixoticism 

Noun: quixotic spirit or tendency towards romantisizing things; unattainable idealism

Lost in his quixoticism, he lived a life of unchecked idealism, dreaming dreams far too unreal and far too out of reach.

quixoticism by Matt Schwab April 4, 2007

quixoticist 

n. a person who is quixotic (exceedingly idealistic; unrealistic and impractical)

Some people think that world peace is but a quixoticist's fantasy.

quixoticist by candidcamel44 July 25, 2009