The word "健壮" is formed through a standard Chinese lexical process called **compound formation**, where two independent, semantically similar characters are combined to create a nuanced, reinforced meaning. The first character, "健" (jiàn), primarily conveys concepts of health, strength, and robustness. The second, "壮" (zhuàng), emphasizes physical might, sturdiness, and vigorous growth. When paired, they create a coordinated compound where each element amplifies the other, resulting in a term that holistically describes a state of being both **robustly healthy and powerfully strong**, often referring to physical physique or vitality.