Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
nŏcīvus, a, um, adj. [noceo], hurtful, injurious, noxious (not ante-Aug., and very rare), Phaedr. 1, 28, 3: pecori nociva, Plin. 20, 2, 6, § 12; Vulg. 1 Tim. 6, 9.