Superlative form of healthy: most healthy.(adjective)
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Use "healthiest" in a sentence
"Afterward, he should anoint his face and wrists with aromatic water and then put on a clean shirt that has been "smoked with some good fragrance — the best and healthiest is rosemary.""
"The multi-family sector of the real estate market is often described as the healthiest of the commercial bunch."
"In a commentary, Dr. Robert W. Blum, of Johns Hopkins Bloomberg School of Public Health, wrote that "although adolescence is often referred to as the healthiest stage of life, [this report] makes clear that young people are at substantial risk for"