Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
plausĭlis, e, adj. [plaudo], that claps applause, applauding, plausive (post-class.): plausilibus ulnis (al. plausibilibus), Sid. Ep. 9, 14; cf.: plausilis, plausibilis, Not. Tir. p. 172.