Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
vĕnusto, āre, v. a. [venustus], to make lovely, beautify: se unguentis, Naev. ap. Fulg. p. 565, 19: ideo primo fecit (fidem) deus, postea venustavit, Ambros. Hexaëm. 1, 7, 27: miracula, id. in Luc. 2, 42.