His unhappiness was understandable.是什么意思？

His unhappiness was understandable.

他不高兴是可以理解的。

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

unhappiness

n. 不快，痛苦，不幸；

例句
He could not bear to lay too much responsibility for the unhappiness of his later years on his own shoulders...
为自己晚景凄凉承担这么多责任，他接受不了。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

understandable

adj. 能懂的，可理解的，可同情的；

例句
Taxes are unpopular — it is understandable that voters are against them...
税收不受欢迎——选民们反对是可以理解的。