The Collaborative International Dictionary of English v.0.48:
Healthiness \Health"i*ness\, n. The state of being healthy or healthful; freedom from disease. [1913 Webster]WordNet (r) 3.0 (2006):
healthiness n 1: the state of being vigorous and free from bodily or mental disease [syn: good health, healthiness] [ant: health problem, ill health, unhealthiness]