Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
cōpŭlātīvus, a, um, adj. [copulo], of or pertaining to connecting, copulative (late Lat.): modus, Cod. Just. 6, 38, 4: conjunctiones, Mart. Cap. 3, § 286, and other gramm.
* Adv.: cōpŭlātīvē, connectedly: dicere (diequinti), Macr. S. 1, 4 med.