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