[syn: callous, indurate, pachydermatous]
The Collaborative International Dictionary of English v.0.48:
Pachydermatous \Pach`y*der"ma*tous\, a.
   1. (Zool.) Of or pertaining to the pachyderms.
      [1913 Webster]
   2. Thick-skinned; not sensitive to ridicule.
      [1913 Webster]
   3. (Med.) Of or pertaining to pachyderma.
      [PJC]
WordNet (r) 3.0 (2006):
pachydermatous
    adj 1: of or relating to or characteristic of pachyderms [syn:
           pachydermatous, pachydermal, pachydermic,
           pachydermous]
    2: emotionally hardened; "a callous indifference to suffering";
       "cold-blooded and indurate to public opinion" [syn:
       callous, indurate, pachydermatous]