IPA: /ˈhɛlθiɪst/
KK: /ˈhɛlθiɪst/
The best or most beneficial for health compared to others.
Eating fruits and vegetables is one of the healthiest choices you can make.
Comparative: healthier
Superlative: healthiest
Healthiest → It is formed from "health" (from Old English *hælu*, meaning wholeness or well-being) and "-iest" (a superlative suffix indicating the highest degree). The word "healthiest" means possessing the highest degree of health or well-being.
Think of 'health' as wholeness or well-being, and remember that 'healthiest' means having the most well-being.
No commonly confused words.