Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
insultātōrĭus, a, um, adj. [insulto], scornful, mocking, insulting (late Lat.): verbum, Tert. adv. Marc. 5, 10.
Adv.: in-sultātōrĭē, scornfully, insultingly, Sid. Ep. 1, 7.