Lewis & Short

ē-vīlesco, lŭi, 3, v. inch. n., to become vile, worthless, despicable (post-Aug. and very rare): nullis sordibus pretium carae pietatis evilescit, Val. Max. 5, 4, 7: pericula, Tac. H. 3, 53: propter quae usque eo eviluit, ut passim ac propalam contemptui esset, Suet. Claud. 15.