underweight

• POS: Adjective
• HYPHEN: un=der=weight

OXFORD DICTIONARY

underweight, adj. & n.
--adj. weighing less than is normal or desirable.
--n. insufficient weight.

THESAURUS

underweight

avoirdupois, bantamweight, beef, beefiness, boniness, bony, deadweight, fatness, featherweight, flat, flat-chested, fleshless, fleshlessness, frailness, gangling, gangly, gaunt, gauntness, gawkiness, gawky, gravity, gross weight, haggardness, hatchet face, heaviness, heft, heftiness, lank, lankiness, lankness, lanky, lantern jaws, lean, lean-fleshed, lean-looking, leanness, lightweight, liveweight, meager, meagerness, neat weight, net, net weight, overbalance, overweight, paperiness, peakedness, ponderability, ponderosity, ponderousness, poorness, poundage, puniness, rawboned, scraggy, scrawniness, scrawny, skeletal, skin and bones, skinniness, skinny, slightness, spare, spareness, spidery, spindling, spindly, thin-bellied, thin-fleshed, tonnage, twigginess, twiggy, undersized, weight, weightiness