noun, noun which may take the genitive case particle 'no'
poor physical condition; feeling unwell
Refers to a state of not feeling well physically, often used in formal or medical contexts. Can be used as a noun or with の to modify another noun.
体調不良のため、今日は休みます。
I'm taking the day off because I'm not feeling well.
彼は体調不良を訴えて早
He complained of feeling unwell and left early.