Μείνε υγιής (Meine ygiis)
* Μείνε (Meine): Stay
* υγιής (ygiis): healthy (masculine singular)
If you're speaking to a woman, you would use the feminine form of healthy:
Μείνε υγιής (Meine ygiis) - While the word *ygiis* is grammatically masculine, it's also commonly used for the feminine form in this context, making it suitable for both genders.
You could also use phrases like:
* Να είσαι καλά (Na ise kala): Be well (more general well-being, including health) - This is a very common and friendly way to say goodbye.
* Προσοχή στην υγεία σου (Prosoche stin ygeia sou): Take care of your health (more emphasis on actively taking care). This is more suitable for situations where you want to emphasize that the person should actively maintain their health.
For most everyday situations, Μείνε υγιής is perfectly acceptable and understood.