Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pĕr-ēlĕgans, antis, adj., very neat, fine, or elegant (class.): genus, Cic. de Or. 2, 67, 270: oratio, id. Planc. 24, 58: ingenium, Vell. 1, 7, 1.
Adv.: pĕr-ēlĕganter, very finely, very elegantly: pereleganter dicere, Cic. Brut. 52, 197.