thin

1 having a noticeably small amount of body fat after her bout with pneumonia, she looked thinner Synonyms bony (also boney), fatless, lean, lithe, skinny, slender, slim, spare, svelte Related Words clean-limbed, trim; sylphlike, willowy; angular, rawboned, scraggy, scrawny, sinewy, wiry; lank, lanky, rangy, reedy, spindling, spindly, stringy, twiggy, waspish, weedy; anorectic (also anoretic), anorexic, cadaverous, emaciated, gaunt, haggard, pinched, skeletal, wasted, wizened; meager (or meagre), puny, slight Near Antonyms beefy, bulky, chunky, fleshy, heavy, heavyset, stocky, stout, thick, thickset, weighty; brawny, burly, husky; dumpy, pudgy, roly-poly, squat, stubby; paunchy, potbellied; flabby, soft; buxom, zaftig (also zoftig); fleshed-out, full, hippy, round Antonyms chubby, corpulent, fat, gross, obese, overweight, plump, portly, rotund, tubby

2 being of less than usual width the thin threads of a cobweb Synonyms fine, hairline, needlelike, paper-thin, skinny, slender, slim, slim-jim, narrow, ultrathinRelated Words attenuate, attenuated, elongate (or elongated), linear; bottleneck, close, compressed, condensed, constricted, contracted, squeezed, tight, tightened; lanky, rangy, reedy, shoestring, spindly, stalky, stringy, twiggy, willowy, wispy; lank, spareNear Antonyms chunky, squat, stocky, stumpy, thick, thickset; bulky, massive, voluminous; thickish, widishAntonyms broad, fat, wide

3 not containing very much of some important element the evidence for that oddball theory is pretty thin Synonyms dilute, diluted, weak, thinned, washy, watery, weakenedRelated Words adulterated, watered-downNear Antonyms enriched, fortified; concentrated, condensed, evaporatedAntonyms full-bodied, rich, strong

to alter (something) for the worse with the addition of foreign or lower-grade substances thinned the cream with milk but didn't tell anyone Synonyms cut, dilute, extend, lace, sophisticate, adulterate, water down, weakenRelated Words load; befoul, contaminate, corrupt, defile, dirty, envenom, foul, infect, poison, pollute, soil, spoil, sully, taint; cheapen, debase, degrade; manipulate, misrepresent, tamper (with); counterfeit, fake, falsify, fudge; doctor, spike; attenuate, moderate, qualify, temperNear Antonyms fertilize, lard; augment, reinforce (also reenforce), supplement; decontaminate, purify; clarify, clean, cleanse, distill (also distil), filter, flush, leach, pasteurize, purge, refine; better, enhance, improve; compact, concentrate, condenseAntonyms enrich, fortify, richen, strengthen