Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

Insŭber, bris, adj. (Insubris for Insuber, Spart. Julian. 1; gen. plur. Insubrium, Plin. 10, 29, 41, § 77: Insubrum, id. 3, 17, 21, § 125), of or belonging to Insubria, a country in the neighborhood of Milan, Insubrian: eques, Liv. 22, 6, 3.
Subst.: Insŭber, an Insubrian: Insuber quidam fuit, Cic. Pis. 15, 34.
Plur.: Insŭbres, ium, m., the Insubrians, Cic. Balb. 14, 32; Liv. 30, 18, 1; 5, 34, 9; Plin. 3, 17, 21, § 124 sq.