thinness

noun

Etymology: From Middle English thynnesse, from Old English þynnes (“thinness, slightness of density, lack of density, tenuity, fluidity, poverty, feebleness of sight, weakness”), equivalent to thin + -ness.

1. The state or quality of being thin.

   “The beautiful prismatic colours seen on the Labrodore stone are owing to a similar cause, viz. the thinness of the laminæ of which it consists […].”

   “Beyond celebrating the aesthetic value of thinness, pro-anas claim that thinness is a reflection of excellence in other areas of one's life.”