1. Of relatively small extent from one surface to the opposite or in cross section
   "a thin book"; "a thin layer of paint"; "thin wire"; "a thin chiffon blouse"
    
2. Lacking excess flesh
   "you can't be too rich or too thin";
   - lean, meager [N. Amer], meagre [Brit, Cdn]
    
3. Very narrow
   "a thin line across the page";
   - slender, slimline
    
4. Not dense
   "a thin beard";
   - sparse
    
5. Flowing easily or low in density; not viscous
   "skimmed milk is much thinner than whole milk"; "thin oil"; "air is thin at high altitudes"; "a thin soup"
    
6. (of sound) lacking resonance or volume
   "a thin feeble cry"
    
7. Lacking spirit or sincere effort
   "a thin smile"
    
8. Lacking substance or significance
   "a thin plot";
   - flimsy, fragile, slight, tenuous

1. Make less dense, numerous or viscous
   "Thin the solution"; "They thinned the forest to prevent fires"
    
2. Lose thickness; become thin or thinner
   "The crowd thinned as the night wore on"
    
3. Lessen the strength or flavour of a solution or mixture
   "She thinned the paint with water";
   - dilute, thin out, cut
    
4. Lose weight quickly or effortlessly
   "She thinned down over the summer";
   - melt off, slim, slenderize, slim down, slenderise [Brit], lose weight

1. Without viscosity
   "the blood was flowing thin";
   - thinly

Derived forms: thinned, thins, thinner, thinnest, thinning

See also: anorectic, anorexic, bladed, body, body weight, bony, cadaverous, capillary, cobwebby, compressed, consistence, consistency, deep-eyed, depressed, diaphanous, distributed, ectomorphic, emaciated, filamentlike, filamentous, filiform, filmy, fine, flat, gangling, gangly, gaunt, gauze-like, gauzy, gossamer, haggard, hairlike, hollow-eyed, hyperfine, insignificant, lank, lanky, light, narrow, pale, paper thin, papery, pinched, rare, rarefied, rarified, rawboned, reedlike, reedy, ribbonlike, ribbony, scarecrowish, scraggly, scraggy, scrawny, see-through, sheer, shriveled [US], shrivelled [Brit, Cdn], shrunken, skeletal, skinny, sleazy [archaic], slender, slender-waisted, slight, slim, slim thick, slim-waisted, spare, spindle-legged, spindle-shanked, spindly, spiritless, stringy, substance, sunken-eyed, svelte, sylphic, sylphlike, tenuous, thickness, threadlike, thready, transparent, trim, twiggy, twiglike, underweight, unimportant, vaporous, vapory [US], vapourous [Brit, non-standard], vapoury [Brit, Cdn], wafer-thin, wasp-waisted, wasted, weedy, wiry, wisplike, wispy, withered, wizen [archaic], wizened

Type of: bring down, change state, cut, cut back, cut down, reduce, trim, trim back, trim down, turn, weaken

Antonym: full, inspissate, thick

Encyclopedia: Thin, Robert