worry; agony
進路について深く煩悶した日々だった。
Those were days of deep anguish over my career path.
彼は人間関係の煩悶に苛まれていた。
He was tormented by anguish over interpersonal relationships.
煩悶の末に決断を下すことができた。
After much anguish, I was finally able to make a decision.