Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
per-mŏlestus, a, um, adj., very troublesome: atque hi non sunt permolesti, Cic. Att. 1, 18, 2.
Adv.: permŏlestē, with much trouble or difficulty: permoleste ferre aliquid, to be much vexed at a thing, Cic. Verr. 2, 4, 58, § 131; id. Att. 15, 17, 1.