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.

Vestīni, ōrum, m., a people of Central Italy, on the Adriatic Sea, Auct. Her. 2, 28, 45; Liv. 8, 29; 10, 3; Plin. 3, 12, 17, § 107.
Hence, Vestīnus, a, um, adj., of or belonging to the Vestini: Vestina virum vis, Enn. ap. Charis. p. 251 P. (Ann. v. 280 Vahl.); so, populus, Liv. 8, 29: cohors, id. 44, 40: juventus, Sil. 8, 516: senex, Juv. 14, 181: aquae, Luc. 2, 425.