Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* per-tŏlĕro, āvi, 1, v. a., to bear out, endure: tormenta aetatis, Lucr. 5, 316: pertolerarem vitam, Att. Trag. Rel. v. 91 Rib.