Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mŏnĭtōrĭus, a, um, adj. [monitor], that serves to remind or admonish, monitory (post-Aug.): fulmen, Sen. Q. N. 2, 39, 2; id. ib. 2, 49, 1.