IPA: /ʌnˈhɛlθi.nəs/
KK: /ʌnˈhɛlθiˌnəs/
The condition of not being healthy, often related to poor diet, lack of exercise, or other factors that negatively affect health.
The unhealthiness of fast food can lead to serious health problems.
Unhealthiness → It is formed from "un-" (meaning not) and "health" (from Old English "hælu", meaning wholeness or well-being) and "-iness" (meaning the state or quality of). The word "unhealthiness" refers to the state of not being healthy or lacking well-being.
Think of 'not' ('un-') being combined with 'wholeness' ('health') to remember that 'unhealthiness' means the state of lacking health.