The word "瘠薄" is formed by combining two characters that each convey the idea of poor quality or thinness: "瘠" means barren or lean, constructed from the radical "疒" (sickness) suggesting a deficient state and the phonetic component "脊", while "薄" means thin or poor, from the radical "艹" (grass) indicating vegetation and the phonetic component "溥". Together, they form a compound where both elements reinforce the meaning to describe land that is infertile and unproductive.