A2having a small distance between two opposite sides: a thin bookthin black linesa thin jacket (= made from thin material)Thin and fineNarrow and thinthinness
/ˈθɪn.nəs/noun[U]›the thinness of his hairThe author discusses why female beauty has become linked to thinness.Small in number and quantityThin or slender (of people)Not fit and healthyNarrow and thin