Thick-skinned

a.

1.

Having a thick skin; hence, not sensitive; dull; obtuse.

Adj.

1.

thick-skinned - emotionally hardened; "a callous indifference to suffering"; "cold-blooded and indurate to public opinion" Synonyms: callous, indurate, pachydermatous

callous, indurate, insensitive, pachydermatous