infalible
infallible
adjective een-fah-LEE-bleh Rare
Origin: From Latin infallibilis.
Also means
unfailing
Usage Note
Infalible is one of the adjectives that ends in -e and therefore has the same form for masculine and feminine: el método infalible / la receta infalible. In Catholic theology it carries a precise technical sense (infalibilidad papal — papal infallibility). In everyday speech it is used hyperbolically for something that never fails.
Examples
"Tienen un método infalible para resolver el problema."
Natural Translation
They have an infallible method for solving the problem.

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