Definitions for "Obdurate"
Hardened in feelings, esp. against moral or mollifying influences; unyielding; hard-hearted; stubbornly wicked.
To harden.
stubbornly persistent in wrongdoing
showing unfeeling resistance to tender feelings; "the child's misery would move even the most obdurate heart"
Keywords:  intractable, rough, harsh, rugged, hard
Hard; harsh; rugged; rough; intractable.