Synonyms and related words :
asininity, blockishness, body, boobishness, boorishness, bovinity, callosity, callousness, cloddishness, concreteness, crassness, crudeness, denseness, dim-wittedness, dimness, doltishness, dull-wittedness, dullardism, dullness, dumbness, duncery, durability, durity, firmness, flintiness, grossness, hardness, hardness of heart, hebetude, impenetrability, induration, lethargy, loutishness, lumpishness, mass, materiality, ninnyism, oafdom, oafishness, obduracy, obtuseness, opacity, palpability, ponderability, resistance, restiveness, simpletonianism, slowness, sluggishness, solidity, sottishness, soundness, stability, steadiness, steeliness, stolidity, stoniness, stoutness, strength, stupidity, sturdiness, substance, substantiality, substantialness, tangibility, thick-headedness, thick-wittedness, toughness, unteachability, wrongheadedness, yokelism