蛮横无理 [- - wú lǐ]be truculent and unreasonable; rude and unreasonable; impervious to all reasons; peremptory; act in a truculent and arbitrary way; arrogant and high-handed:
•¶ 公司蛮横无理地拒绝了明显正当的要求 the company's vexatious refusal to pay an apparently valid claim