Stubbornness; obstinacy — the tendency to refuse to change one's opinion or behavior, often out of pride or willful determination.
彼は意地で謝ろうとしなかった。
He refused to apologize out of stubbornness.
あの子は意地が強くて、人の助けを素直に受けない。
That child is very stubborn and won't accept help easily.
意地を張っても状況は変わらない。
Being stubborn won't change the situation.
Disposition; nature — a person's inherent temperament or character.
彼女の意地は意外と繊細で、人前では見せないところがある。
Her disposition is surprisingly delicate; there are things she doesn't show in public.
負けず嫌いなのが彼の意地だ。
Being a sore loser is part of his nature.
Appetite; desire; greed — can refer to appetite or covetousness (often seen in forms like '意地汚い' meaning greedy).
彼は意地汚く残り物を全部食べてしまった。
He greedily ate all the leftovers.
おもちゃを離さないのはただの意地だ。
Refusing to let go of the toy is just stubborn desire.