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infallible

adjective
🔊/ɪnˈfæləbl/
🔊/ɪnˈfæləbl/
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  1. never wrong; never making mistakes永无过失的；一贯正确的
    • infallible advice绝对正确的忠告
    • Doctors are not infallible.医生并非永不犯错。🔊🔊
    opposite fallible
  2. that never fails; always doing what it is supposed to do绝对可靠的；万无一失的
    • an infallible method of memorizing things百试百灵的记忆方法
    Topics Successc2
    3. Word Originlate 15th cent.: from French infaillible or late Latin infallibilis, from in- ‘not’ + Latin fallere ‘deceive’.