Comparative form of unhealthy: more unhealthy(adjective)
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Use "unhealthier" in a sentence
"The only enviroment that I can think of that would be unhealthier is if she was a crack ho in detroit."
"The reason "unhealthier" food is so prevalent is because it allows companies to easily monetize it with high profit margins, a key for businesses to grow, expand, and survive."
"I'm not sure if these are the exact reasons why "unhealthier" food is so much cheaper than"