| penitent | Feeling or showing sorrow and regret for having done wrong; repentant | |
| penurious | Extremely poor; poverty-stricken | |
| penury | Extreme poverty; destitution | |
| peregrinate | To travel or journey, especially to walk on foot | |
| peremptory | Insisting on immediate attention or obedience, especially in a brusquely imperious way | |
| perennial | Lasting or existing for a long or apparently infinite time; enduring or continually recurring | |
| peripatetic | Traveling from place to place, especially working or based in various places for relatively short periods | |
| peripheral | Relating to or situated on the edge or periphery of something | |
| permeated | To spread throughout, pervading every part | |
| pernicious | Having a harmful effect, especially in a gradual or subtle way | |