is a specific kind of: exiguity, leanness, meagerness, meagreness, poorness, scantiness, scantness.

derivation: bare, scanty, spare | sparse, thin | spare, trim | thin | flimsy, fragile, slight, tenuous, thin.

is a specific kind of: bodily property.

is a broader term that covers: scrawniness, skinniness | boniness, bonyness, emaciation, gauntness, maceration | slenderness, slightness, slimness | wiriness.

is the opposite of: avoirdupois, blubber, fat, fatness.

derivation: lean, thin.