mulish
From Longman Dictionary of Contemporary Englishmulishmul‧ish /ˈmjuːlɪʃ/ adjective written STUBBORNrefusing to do something or agree to something, in an unreasonable way SYN stubborn a mulish lookExamples from the Corpusmulish• George could sometimes be almost mulish!• When he got that mulish look there was no talking to him.• mulish obstinacy• Implacable, with arms folded, and a mulish pout.• Between the listing buoys and sandbanks two mulish tugs were pulling a tanker loaded with glass from Pilkington's.