impeccable
Meaning: exemplary, flawless
Usage: If your grades were as impeccable as your sister’s, then you too would receive a car for a graduation present.
divine
Meaning: godly, exceedingly wonderful
Usage: Terribly fond of desserts, she found the rich chocolate cake to be divine.
Note: The adjective form of divine means something different from divine (v.), meaning to foretell or discover by intuition; related forms include diviner (n.) and divination (n.).
paradigm
Meaning: an example that is a perfect pattern or model
Usage: Because the new SUV was so popular, it became the paradigm upon which all others were modeled.
paragon
Meaning: a model of excellence or perfection
Usage: The mythical Helen of Troy was considered a paragon of female beauty.
epitome
Meaning: a perfect example, embodiment
Usage: My mother, the epitome of good taste, always dresses more elegantly than I do.
utopia
Meaning: an imaginary and remote place of perfection
Usage: Everyone in the world wants to live in a utopia, but no one can agree how to go about building one.