underweight

having little weight the long illness left him frail and underweight Synonyms featherlight, feathery, lightweight, light, weightlessRelated Words bantam, diminutive, little, minute, puny, small, smallish, tiny, undersized (also undersize), wee; flimsy, fragile, insubstantial; petite, slender, slight, slim, thinNear Antonyms big, considerable, extensive, goodly, great, handsome, huge, hulking, jumbo, king-size (or king-sized), large, largish, massive, overscale (or overscaled), oversize (or oversized), sizable (or sizeable), substantial, super, voluminous, whacking; bulky, cumbersome, unwieldyAntonyms heavy, hefty, leaden, overweight, ponderous, weighty