unhealthiest
un-health-i-est
adjective
Superlative form of 'unhealthy', describing something most detrimental to well-being.
"Eating too much processed food is often considered the unhealthiest option."
Thesaurus
Synonyms: unhealthy, unhealthful, insalubrious, unwholesome, caseous, puffy, cytomegalic, carbuncular, dehydrated, sore-eyed, asthmatic, rheumatic
Antonyms: healthy