123 synonyms for thin such as cut back, attenuate, chiffony, angular, inadequate, dilute, feeble, faint, become less dense/numerous, and become less in number. Thin is an adjective, and its antonyms are thick and broad.
Attenuate, attenuated, fine, narrow, paper-thin, papery, pencil-thin, threadlike, and wafer-thin.
Chiffony, delicate, diaphanous, filmy, fine, flimsy, floaty, gauze-like, gauzy, gossamer, insubstantial, light, lightweight, see-through, sheer, translucent, and transparent.
Angular, as thin as a rake, as thin as a reed, bony, cadaverous, emaciated, gangling, gangly, gaunt, gracile, hollow-cheeked, lanky, lean, like a matchstick, like a skeleton, macilent, pinched, rangy, raw-boned, reedy, scraggy, scrawny, size-zero, skeletal, skin-and-bones, skinny, slender, slight, slim, spare, spindle-shanked, spindly, starveling, sticklike, stringy, svelte, sylphlike, underfed, undernourished, underweight, wasted, weedy, and willowy.
Inadequate, insufficient, meagre, paltry, poor, scanty, scattered, sparse, thinning, and wispy.
Dilute, diluted, runny, slap, sloppy, thinned down, watered down, watery, and weak.
Feeble, flimsy, implausible, inadequate, insubstantial, insufficient, poor, shallow, slight, tenuous, threadbare, unbelievable, unconvincing, and weak.
Faint, feeble, high-pitched, low, reedy, small, soft, and weak.
Become less dense/numerous, become less in number, cut back, decrease, diminish, disperse, dissipate, dwindle, lessen, prune, scatter, and trim.