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.

Sĭnŭessa, ae, f., a colony of the Latins, formerly called Sinope, in Campania, now ruins near Monte Dragone, Mel. 2, 4, 9. Plin. 3, 5, 9, § 59; Liv. 10, 21, 8; Cic. Att. 9, 15, A, 6; 9, 16, 1; Ov. M. 15, 715.
Hence, Sĭnŭessuānus, a, um, adj., of or belonging to Sinuessa: deversoriolum, Cic. Fam. 12, 20; id. Att. 14, 8, 1.
Absol.: mansi in Sinuessano, the Sinuessan estate, Cic. Att. 15, 1, B, 1: aquae, Plin. 31, 2, 4, § 8: ager, id. 2, 93, 94, § 208; cf. lacus, Mart. 11, 7, 12; 13, 11, 1: Petrinum, Hor. Ep. 1, 5, 5.