adj. 25B6; adjective
a thin white line : NARROW, fine, attenuated.
a thin cotton nightdress : LIGHTWEIGHT, light, fine, delicate, floaty, flimsy, diaphanous, gossamer, insubstantial; sheer, gauzy, filmy, chiffony, transparent, see-through.
a tall, thin woman : SLIM, lean, slender, rangy, willowy, svelte, sylphlike, spare, slight; SKINNY, underweight, scrawny, scraggy, bony, angular, raw-boned, hollow-cheeked, gaunt, as thin as a rake/reed, stick-like, skin and bone, emaciated, skeletal, wasted, pinched, undernourished, underfed; lanky, spindly, gangly, gangling, weedy; informal anorexic, like a bag of bones; dated spindle-shanked; archaic starveling.
his thin grey hair : SPARSE, scanty, wispy, thinning.
a bowl of thin soup : WATERY, weak, dilute, diluted; runny, sloppy.
her thin voice : WEAK, faint, feeble, small, soft; reedy, high-pitched.
the plot is very thin : INSUBSTANTIAL, flimsy, slight, feeble, lame, poor, weak, tenuous, inadequate, insufficient, unconvincing, unbelievable, implausible.
thick, broad, fat, abundant.
25B6; verb
some paint must be thinned down before use : DILUTE, water down, weaken.
the crowds were beginning to thin out : DISPERSE, dissipate, scatter; become less dense/numerous, decrease, diminish, dwindle.