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spite; resentment
不当な扱いを受けて業腹に感じた。
I felt resentful at being treated unfairly.
業腹ではあるが冷静に対処するしかない。
Though resentful, one can only deal with it calmly.
彼の無礼な態度が業腹でたまらなかった。
His rude attitude was unbearably infuriating.