1. The quality of resembling clay, i.e. in thickness or consistency
   "And it uses clay (well, something Play Doh-like in its clayishness)";
   - clayeyness, clayiness
    
2. The quality of being composed of clay
   "During periods of excess moisture, grazing needs to be restricted in many places because of the clayishness of the surface soil.";
   - clayeyness, clayiness

Type of: body, consistence, consistency, substance