pessimist

n.悲观的人，悲观主义者

perturbation, perturbed, perusal, peruse, pervade, pervasion, pervasive, pervasively, pervasiveness, perverse, perversely, perverseness, perversity, perversion, perversity, pervert, peseta, pesky, peso, pessary, pessimism, pessimistic, pessimistically, pest, pest control, pester, pesticide, pestilence, pestilent, pestle, pet, pet name, pet shop, pet subject, petal, petalled (US petaled), petard, peter, petit bourgeois, petite, petition,