expression, godan verb (-ru)
Describes a person who stubbornly sticks to their own opinion or way, often unreasonably. The phrase carries a negative nuance of inflexibility.
彼は片意地を張って、自分の意見を変えようとしなかった。
He was obstinate and wouldn't change his opinion.
そんなに片意地を張らないで、少しは人の話も聞きなさい。
Don't be so stubborn; listen to what others have to say a little.