”他似乎也是一肚子苦衷”翻译成英文怎么说

He seems full of grievance.

grievance
griev.ance
AHD:[gr¶“v…ns]
D.J.[6gri8v*ns]
K.K.[6griv*ns]
n.（名词）
An actual or supposed circumstance regarded as just cause for protest.
不平之事，委屈：被认为是抗议的合理理由的一种实际的或设想中的情况
A complaint or protestation based on such a circumstance.See Synonyms at injustice
不平，气恼，牢骚：因这种情况引起的抱怨或抗议参见 injustice
Indignation or resentment stemming from a feeling of having been wronged.
气愤，愤恨：因被误解而产生的气愤或愤恨
Obsolete
【废语】
The act of inflicting hardship or harm.
苦难：使人受伤害或磨难的行为
The cause of hardship or harm.
苦难的原因：磨难或伤害的原因

he is full of complaints. 他充满了抱怨。也就是一肚子苦哀。

he is full of grievances