<p><strong>Adjective</strong></p><ul><li>absolutely trustworthy or sure: an infallible rule.</li><li>unfailing in effectiveness or operation; certain: an infallible remedy.</li><li>not fallible; exempt from liability to error, as persons, their judgment, or pronouncements: an infallible principle.</li><li>immune from fallacy or liability to error in expounding matters of faith or morals by virtue of the promise made by Christ to the Church.</li></ul><p><strong>Noun</strong></p><ul><li>an infallible person or thing.</li></ul><p><strong>End of Response</strong></p>