(n.) The quality or state of being thick (in any of the senses of the adjective).

adhesiveness band bed bedding belt bodily size body bulk cacophony clabbering clamminess closeness clotting coagulation coarseness colloidality compactness congestedness congestion consistence consistency corpulence couche course cracked voice crowdedness curdling deck denseness density depth discord distance through doughiness dryness fatness firmness floor gallery gelatinity gelatinousness gluelikeness gluiness glutinosity glutinousness grossness gruffness gumlikeness gumminess gutturalism gutturality gutturalness hardness harshness heaviness hoarseness huskiness impenetrability impermeability imporosity incompressibility incrassation inspissation jammedness jellification jellylikeness layer ledge lentor level mass measures mucilaginousness overlayer overstory pastiness raspiness raucity relative density ropiness roughness rudeness scrapiness scratchiness seam shelf slabbiness sliminess solidity solidness specific gravity spissitude stage step stertorousness stickiness stodginess story stratum stringiness substratum superstratum syrupiness tackiness tenaciousness tenacity the third dimension thickening throatiness tier topsoil toughness treacliness ugliness underlayer understory understratum viscidity viscosity viscousness zone