体質

noun

disposition of the body; body type; physique; (medicine) constitution; predisposition / (by extension) nature (in general)

彼は体質的に寒さに弱い。

He is constitutionally weak to cold.

意味（1）

disposition of the body; body type; physique; (medicine) constitution; predisposition

ikura tabete mo futoranai taishitsu'type of body' that doesn't gain weight no matter how much one eats

意味（2）

(by extension) nature (in general)