Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pī̆grĕo, ēre, v. n. [piger], to be slow, sluggish, reluctant (ante-class.): post aetate pigret sufferre laborem, Enn. ap. Non. 219, 12 (Ann. v. 405 Vahl.): omnes gaudent facere recte, male pigrent, Att. ap. Non. 14.