infallible

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in·fal·li·ble / inˈfaləbəl/ • adj. incapable of making mistakes or being wrong: doctors are not infallible. ∎  never failing; always effective: infallible cures. ∎  (in the Roman Catholic Church) credited with papal infallibility: for an encyclical to be infallible the pope must speak ex cathedra.DERIVATIVES: in·fal·li·bly / -blē/ adv.