noun
weak constitution; frail health
Describes a person who is physically weak, gets sick easily, or has low stamina. Often used in medical or everyday contexts.
彼は虚弱体質で、よく風邪をひく。
He has a weak constitution and often catches colds.
子供の頃は虚弱体質だったが、今は健康だ。
I had a frail constitution as a child, but now I'm healthy.
Compound of 虚弱 (weakness, frailty) and 体質 (constitution, physical makeup). The word is a straightforward Sino-Japanese compound.