clayeynessn.

/ˈkleɪɪnɪs/Etymology: < clayey adj. + -ness suffix.
the world > the earth > structure of the earth > constituent materials > earth or soil > soil qualities > [noun] > clayey quality
1888 J. R. Lowell 13 Aug. (1894) II. 400 Slippery from clayeyness of soil.
This entry has not yet been fully updated (first published 1933; most recently modified version published online March 2018).