noun, noun or participle which takes 'suru'
anguish; agony; mental torment
A yojijukugo expressing deep mental suffering, worry, and distress. Often used in literary or formal descriptions of inner turmoil.
彼は将来への不安で懊悩煩悶している。
He is in anguish over his future.
After much mental torment, he made a decision.