Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
plausĭbĭlis, e, adj. [plaudo], deserving applause, praiseworthy, acceptable, pleasing (class.): censorium nomen (with populare), Cic. Div. in Caecil. 3, 8: oratio, Sen. Ep. 5, 9: locus, Quint. 4, 3, 1.
Hence, adv.: plau-sĭbĭlĭter, with applause (post-class.): ingenium plausibilius manifestare, with more applause, Sid. Ep. 8, 10.