Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
per-plăcĕo, ēre, v. n., to please greatly: ecquid placeant, me rogas? immo hercle vero perplacent, Plaut. Most. 3, 3, 4: servi mei perplacet mihi consilium, id. Merc. 2, 3, 14: perplacet (as affirm. answer), Ter. Heaut. 5, 5, 22 (Fleck. satis placet): ea (lex) mihi perplacet, Cic. Att. 3, 23, 4.