na-adjective, noun
Describes a person's stubborn, unyielding attitude, often with a nuance of being unreasonably obstinate. Used as a noun or adjectival noun.
彼は片意地で、自分の意見を曲げようとしない。
He is stubborn and refuses to change his opinion.
あの人の片意地な態度には困ったものだ。
That person's obstinate attitude is troublesome.
意地 means willfulness or obstinacy; 片意地 adds the nuance of being one-sided or biased.
Compound of 片 (kata, 'one-sided') and 意地 (iji, 'disposition, willfulness'), literally meaning 'one-sided stubbornness'. The reading かたいじ is a rendaku form.