Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* undŭlātus, a, um, adj. [undo, I. B. 2. and II. p. a.], diversified as with waves (like watered stuffs), undulated: togae, Varr. ap. Non. 189, 26 (cited also in Plin. 8, 48, 74, § 195).