Philistine brazen callous calloused case-hardened cold cold of heart coldblooded coldhearted conscienceless flinthearted flinty hard hard of heart hard-boiled hardened heartless impervious indurated insensitive inured lost to shame obdurate pachydermatous proof against seared shameless steeled against steely stony stonyhearted thick-skinned unblushing uncompassionate unemotional unfeeling unmerciful unnatural unresponsive unsympathetic