Source : Webster's Revised Unabridged Dictionary (1913)

Stolidity \Sto*lid"i*ty\, n. [L. stoliditas.]
   The state or quality of being stolid; dullness of intellect;
   obtuseness; stupidity.

         Indocile, intractable fools, whose stolidity can baffle
         all arguments, and be proof against demonstration
         itself.                                  --Bentley.

Source : WordNet®

stolidity
     n 1: apathy demonstrated by an absence of emotional reactions
          [syn: {emotionlessness}, {impassivity}, {impassiveness},
           {phlegm}, {indifference}, {unemotionality}]
     2: an indifference to pleasure or pain [syn: {stoicism}, {stolidness}]