Adjective
stonehearted (comparative more stonehearted, superlative most stonehearted)
Hardhearted; pitiless; unfeeling.
At first glance, My Super Sweet 16 appears to be a sugary bit of reality drizzle about some irritating American brats, but the more you watch it the more you realize it's actually a stonehearted exposé of everything that's wrong with our faltering so-called civilization. Charlie Brooker