Source : Webster's Revised Unabridged Dictionary (1913)

Pachydermatous \Pach`y*der"ma*tous\, a.
   1. (Zo["o]l.) Of or pertaining to the pachyderms.

   2. Thick-skinned; not sensitive to ridicule.

Source : WordNet®

pachydermatous
     adj 1: of or relating to or characteristic of pachyderms [syn: {pachydermal},
             {pachydermic}, {pachydermous}]
     2: emotionally hardened; "a callous indifference to suffering";
        "cold-blooded and indurate to public opinion" [syn: {callous},
         {thick-skinned}, {indurate}]