na-adjective, noun
unhealthy; poor health; ill health
Describes a person, lifestyle, diet, appearance, or condition as not healthy. As a noun, it refers to the state of being unhealthy rather than a specific disease.
夜更かしと外食ばかりで、不健康な生活になっている。
With all the late nights and eating out, my lifestyle has become unhealthy.
彼は自分の不健康を気にして、運動を始めた。
Concerned about his poor health, he started exercising.
顔色が少し不健康に見える。
Your complexion looks a little unhealthy.