infallible
adj. 绝对可靠的；绝无错误的
n. 永远正确的人；绝无谬误的事物
例句
Doctors are not infallible.
医生并非永不犯错。
《牛津词典》
Although he was experienced, he was not infallible.
尽管他经验丰富，却并非不会出错。
《柯林斯英汉双解大词典》
Public schools are often viewed as infallible sacred cows.
公立学校常被认为是批评的禁区。
