1. A healthy reddish complexion
   "The rosiness of his cheeks spoke of his outdoor lifestyle";
   - ruddiness
    
2. A rosy colour (especially in the cheeks) taken as a sign of good health
   "Her rosiness after the run indicated good circulation";
   - bloom, blush, flush
    
3. A dusty pink colour
   "Her cheeks had a natural rosiness after the brisk walk";
   - rose

Type of: complexion, good health, healthiness, pink, skin color [US], skin colour [Brit, Cdn]