Thin
Narrow
Synonyms Narrow, pencil-thin, attenuated, wafer-thin, papery, fine, threadlike, attenuate, and paper-thin.
Lightweight
Synonyms Lightweight, fine, floaty, diaphanous, insubstantial, gauzy, filmy, transparent, translucent, light, delicate, flimsy, gossamer, sheer, gauze-like, chiffony, and see-through.
Slim
Synonyms Slim, slender, willowy, sylphlike, slight, underweight, scraggy, angular, hollow-cheeked, as thin as a rake, like a matchstick, size-zero, emaciated, cadaverous, wasted, undernourished, lanky, stringy, gangling, weedy, gracile, macilent, lean, rangy, svelte, spare, skinny, scrawny, bony, raw-boned, gaunt, as thin as a reed, sticklike, skin-and-bones, skeletal, like a skeleton, pinched, underfed, spindly, gangly, reedy, spindle-shanked, and starveling.
Sparse
Synonyms Sparse, wispy, meagre, poor, insufficient, scanty, thinning, paltry, inadequate, and scattered.
Watery
Insubstantial
Synonyms Insubstantial, slight, poor, shallow, threadbare, insufficient, unbelievable, flimsy, feeble, weak, tenuous, inadequate, unconvincing, and implausible.
Weak
Decrease
Synonyms Become less dense/numerous, diminish, lessen, disperse, scatter, cut back, decrease, dwindle, become less in number, dissipate, prune, and trim.
Example Sentences
He wore a thin jacket in the cold.
The soup was too thin to enjoy.
She has thin, delicate fingers.
The paper is very thin and tears easily.
He has a thin layer of hair on his head.
The ice looks thin and unsafe.
Her voice sounded thin over the phone.
A thin stream of water trickled down.
He sliced the bread very thin.
The air was thin at the mountain peak.