idealistic

Of, relating to, or having the nature of an idealist or idealism.

adjective

1. Showing a tendency to envision things in perfect but unrealistic form: utopian, visionary. See hope/despair, real/imaginary.
2. Not compatible with reality: quixotic, romantic, starry-eyed, unrealistic, utopian, visionary. See hope/despair, real/imaginary.

Definition: utopian
Antonyms: cynical, defeatist, realistic

The adjective has 3 meanings:

Meaning #1: of or relating to the philosophical doctrine of the reality of ideas
  Synonym: ideal
  Pertains to noun: idealism (meaning #1)

Meaning #2: represented in the abstract rather than as they really are
  Synonym: ideal

Meaning #3: of high moral or intellectual value; elevated in nature or style
  Synonyms: exalted, high-flown, high-minded, lofty, rarefied, rarified, noble-minded