* Ευεξία (Euexia): This is probably the closest single word. It literally translates to "good condition" or "well-being," encompassing a sense of overall health and vitality.
* Υγεία (Ygeia): This means "health," primarily physical health. While not encompassing the full breadth of "wellness," it's a crucial component.
* Ευζωία (Euzoia): This means "good life" or "flourishing," referring to a state of thriving and living well, incorporating aspects of both physical and mental well-being.
The best choice depends on the context. For a broad understanding of wellness, Ευεξία (Euexia) is a strong contender. If you're focusing more on the physical aspect, Υγεία (Ygeia) is appropriate. For a more holistic, flourishing life approach, Ευζωία (Euzoia) might be preferred.