pachyderm

noun

1. (obsolete)A member of the obsolete taxonomic order Pachydermata, grouping of thick-skinned, hoofed animals such as the rhinoceros, hippopotamus, elephant and tapir.
2. (informal)An elephant.

   “And so it happened that before the elephant realized that his new enemy had leaped from his path Tarzan had driven his iron-shod spear from behind the massive shoulder straight into the fierce heart, and the colossal pachyderm had toppled to his death at the feet of the ape-man.”

   “Among five score pachyderm / Each canopied and passengered / Sit the duke and the duchess' luscious young girls”

   “In September 2008[…] Portfolio rented an elephant to illustrate an article about JPMorgan Chase’s credit derivatives desk, because the editors had decided on the headline “The $58 Trillion Elephant in the Room.” Condé spent about $30,000 photographing the pachyderm, instead of using a stock image.”

3. (figuratively)A person with thick skin; someone who is not affected by or does not care what others say about them.
4. (figuratively)Someone who is insensitive.