Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
temno, ĕre, v. a. [root tam-, to cut; Gr. τέμνω], to slight, scorn, disdain, despise, contemn (poet. and very rare for the class. contemnere); semper aves quod abest praesentia temnis, Lucr. 3, 957; jejunus raro stomachus vulgaria temnit, Hor. S. 2, 2, 38: divos, Verg. A. 6, 620: praeteritum temnens extremos inter euntem, Hor. S. 1, 1, 116: ne temne, quod ultro Praeferimus manibus vittas et verba precantia, Verg. A. 7, 236: pars non temnenda decoris, Ov. A. A. 3, 299; cf.: haud temnendae manus ductor, Tac. H. 3, 47.