頑固な (translations)→ dogged headstrong intransigent mulish opinionated stubborn willful
血も涙もない (translations)→ heartless mindless ruthless
険しい (translations)→ baleful brooding difficult hard harsh hostile sour steep wile-eyed
残酷な (translations)→ brutish cruel cruelly draconian exquisite unkind unmerciful
冷酷な (translations)→ acrid cold cold-hearted dangerous