Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
per-tĭmĕo, ŭi, 2, v. n., to fear greatly, to be very timid, Lact. 6, 17, 17: non pertimentes ullam perturbationem, Vulg. 1 Pet. 3, 6 (al. praetim).
per-tĭmesco, mŭi, 3, v. inch. a. and n., to become very much frightened, to be greatly afraid of any thing, to fear greatly: si tantam religionem non pertimescebas, etc., Cic. Verr. 2, 4, 35, § 78: id vero non mediocriter pertimesco, id. Quint. 1, 1: nomen imperii etiam in levi personā pertimescitur, id. Agr. 2, 17, 45: fames esset pertimescenda, Caes. B. G. 5, 29: non putavi famam inconstantiae mihi pertimescendam, Cic. Fam. 1, 9, 11: ne quid peccasset, pertimescebat, id. Sest. 49, 105: nec illi umquam de se pertimescent, id. ib. 43, 94: graviter de suis periculis fortunisque omnibus pertimescunt, id. Verr. 2, 5, 44, § 115; so, de aliquā re, id. Div. in Caecil. 21, 71.
Absol., Plaut. Truc. 4, 2, 60; id. Bacch. 4, 8, 21.