General Synonyms:
* Perfect
* Optimum
* Best
* Excellent
* Superior
* Prime
* Ultimate
* Desirable
* Sought-after
More Specific Synonyms:
* For a concept or vision: Utopian, visionary, exemplary
* For a person: Role model, paragon, exemplar
* For a situation: Perfect, idyllic, blissful
Antonyms:
* Imperfect
* Inferior
* Subpar
* Undesirable
* Unrealistic
It's important to choose the synonym that best fits the specific context of your writing. For example, "perfect" might be a good synonym for "ideal" when describing a physical object, while "utopian" might be better when describing a society.