Thin

chudy

(having little body fat or flesh; slim; slender; lean; gaunt)

cienki

(having little thickness or extent from one surface to its opposite)

cienki

(very narrow in all diameters; having a cross section that is small in all directions)

rzadki

(of low viscosity or low specific gravity — see also watery, liquidy, diluted)

rzadki

(scarce)

wąski

(very narrow in all diameters; having a cross section that is small in all directions)

przerzedzić

(to remove plants)

rozcieńczyć

(to dilute)

rozrzedzić

(to dilute)