Word Study
subtility
CIDE DICTIONARY
subtility, n. [L. subtilitas: cf. F. subtilité. See Subtle.].
Subtilty. [1913 Webster]
ROGET THESAURUS
subtility
Rarity
N rarity, tenuity, absence of solidity, subtility, subtilty, subtlety, sponginess, compressibility, rarefaction, expansion, dilatation, inflation, subtilization, vaporization, evaporation, diffusion, gassification, ether, rare, subtile, thin, fine, tenuous, compressible, flimsy, slight, light, cavernous, spongy, rarefied, unsubstantial, uncompact, incompressed, rarefiable.For further exploring for "subtility" in Webster Dictionary Online