Describes a person's stubborn, unyielding attitude, often with a nuance of being unreasonably obstinate. Used as a noun or adjectival noun.
He is stubborn and refuses to change his opinion.
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.
Formed from 片 “one-sided” and 意地 “disposition, obstinacy,” describing a will fixed stubbornly in one direction.