irreproachable
词根词缀：
irrigate v. 灌溉
ir 向内，进入 + rig 浇水 + ate 做，造成，使… → 让水进入 → 灌溉
irrupt v. 闯入
ir 向内，进入 + rupt 断 → 打断进入 → 闯入
irruption n. 闯入
irrupt的名词
irradiate v. 照射
ir 表加强 + radi 光线，辐射 + ate 做，造成，使… → 照射
irritate v. 激怒；刺激
ir 表加强 + rit 擦 + ate 做，造成，使… → 摩擦 → 激怒
数据来源：新东方英语词汇速记大全
相关例句：
That lady, prudent and reserved, maintained an irreproachable demeanour.
这位女士，持重，谨慎，保守了无可非议的品行。
We will not quarrel for the greater share of blame annexed to that evening, said Elizabeth. The conduct of neither, if strictly examined, will be irreproachable; but since then, we have both, I hope, improved in civility.
伊丽莎白说：那天下午的事，究竟应该谁多负责任，我们也用不着争论了，严格说来，双方的态度都不好，不过从那次以后，我觉得我们双方都比较有礼貌些了。
A man of irreproachable conduct commands the respect of others.
为人处世品行方正的人受人敬佩。
"Listen& when one bears an irreproachable name, as I do, one is rather sensitive."
“听着：当一个人有了象我这样没受过玷污的名誉的时候，他总是有点敏感的。”
Courage should be great and the mind clear, knowledge should be general and conduct irreproachable Ambition for personal gain egged the bourgeois careerist on.
胆欲大而心欲小，智欲圆而行欲方个人利欲支配着这个资产阶级野心家的行动。
It emerged that her past behaviour was far from irreproachable.
事实表明，她过去的行为绝非无可非议。