perversity

n. 刚愎，背理行为

pertinacity, pertinence, pertinent, pertinently, pertly, pertness, perturb, perturbation, perturbed, perusal, peruse, pervade, pervasion, pervasive, pervasively, pervasiveness, perverse, perversely, perverseness, perversity, perversion, pervert, peseta, pesky, peso, pessary, pessimism, pessimist, pessimistic, pessimistically, pest, pest control, pester, pesticide, pestilence, pestilent, pestle, pet, pet name, pet shop, pet subject,