Maunoury studied classics at the preparatory seminary in Séez, to which institution he returned after his theological course, and where he spent the whole of his long priestly career.
During this period, keeping abreast of the progress of Hellenistic studies in France and Germany, he composed, published and revised those of his works (Grammaire de la Langue Grecque, Chrestomathie etc.)
In 1877, he became canon of the cathedral of Séez and, the following year, he began to publish his commentaries on all the Epistles of the New Testament.
in Psalmos (Commentary on the Psalms; 2 vols., Paris), a Latin work, written almost exclusively on the basis of the Vulgate and the Septuagint.
His only contribution to apologetics is a volume entitled Soirées d'Automne, ou la Religion prouvée aux gens du monde (Paris, 1887).