His failure to appear raises serious doubts as to his reliability.是什么意思？

His failure to appear raises serious doubts as to his reliability.

他未露面实在使人怀疑他是否可靠。

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。

failure

n. 失败，不及格，缺乏，不足，破产，倒闭，失败的事，失败者；

例句
This was clearly a failure by someone who thought he was above failure...
这显然是认为自己根本不会失败的人所遭遇的一次失败。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

appear

vi. 出现，显现，出庭，出场，演出，似乎；

例句
He was ordered to appear the following day, but absconded...
他被传唤于第二天出庭，可是他逃跑了。

raises

n. 举起，加薪，增加；v. 扬起，建造，饲养，引起( raise的第三人称单数 )，提高（价格等），提起，唤起；

例句
The British Legion raises funds to help ex-service personnel and their dependants.
英国退伍军人协会筹集款项帮助退役人员和他们的家属。

serious

adj. 严肃的，严重的，认真的，庄重的，重要的，危险的；

例句
She was involved in a serious car accident last week...
上星期她卷入了一场严重的车祸。

doubts

n. 怀疑，疑虑( doubt的名词复数 )，未确定；v. 怀疑，疑惑( doubt的第三人称单数 )；

例句
Perhaps you've some doubts about the attack. In that case it may interest you to know that Miss Woods witnessed it...
你也许对这起袭击还有些怀疑。那么如果我告诉你伍兹小姐亲眼目睹了这起事件，你可能会感兴趣。

as

adv. 同样地，一样地，例如；prep. 作为，以…的身份，如

例句
As far as I can recall, Patti was a Smith.
我记得帕蒂是姓史密斯的。

reliability

n. 可靠，可信赖；

例句
Car buyers are more interested in safety and reliability than speed.
购车者们更感兴趣的是汽车的安全性和可靠性，而不是它的速度。