infallible
/ɪnˈfælɪbəl/ noun C2- A person who, or an object or process that, is taken as being infallible.
Plural infallibles
From the library
Don’t you see that it gives us an infallible test for blood stains.
His conclusions were as infallible as so many propositions of Euclid.
“This devil of a fellow,” he muttered, shaking his head; “I said at the time he would create a sensation here, and I measure his effect by an infallible thermometer.
However,” continued Monte Cristo, drawing a small phial from his pocket, “I have an infallible remedy.”
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