permit, n. warrant, license, leave, permission.

pernicious, a. deleterious, harmful, noisome, baleful, vicious.

pernickety, a. (Colloq.) finical, particular, fastidious, fussy.

perpendicular, a. upright, vertical.  Antonyms:  horizontal oblique.

perpetual, a.  See everlasting.

perplex, v. bewilder, puzzle, pose, confuse, mystify, distract, disconcert, entangle.

perplexed, a. bewildered, confused, puzzled, disconcerted.

perplexing, a. bewildering, confusing, carking, mystifying, puzzling.

perplexity, n. bewilderment, distraction, confusion, disconcertion, doubt, uncertainty, predicament, dilemma, plight, quandary, difficulty, strait.

persecute, v. harass, oppress, tyrannize, torment, dragoon, importune, annoy, hector, badger.

persecution, n. oppression, molestation, importunity.

perseverance, n. persistence, diligence, constancy, indefatigableness, assiduity, pertinacity.

persevere, v. persist, continue.

persevering, a. persistent, steadfast, untiring, indefatigable, pertinacious, unremitting, indomitable.  Antonyms:  inconstant, fickle, unsteadfast.

persist, v. persevere.

persistency, n. perseverance, doggedness, pertinacity, obstinacy, contumacy, insistence.

persistent, a. contumacious, persevering, insistent, pertinacious, tenacious, importunate, constant.

personality, n. individuality; reflection, stricture, animadversion, criticism.

personally, adv. individually.

personate, v. impersonate.

personation, n. impersonation.

perspiration, n.  See sweat.

perspire, v. sweat.

persuade, v. induce.

persuasion, n. inducement, suasion, incitement; creed, belief.  Antonyms:  dissuasion, coercion, constraint.

persuasive, a. persuasory.

pert, a. sprightly, dapper, nimble; forward, bold, saucy, malapert.

pertain, v. appertain.

pertinacious, a. resolute, determined, stubborn.

pertinacity, n. resoluteness, persistence, doggedness, stubbornness.

pertinence, n. relevancy, applicability, propriety.  Antonyms:  impertinence, irrelevance.

pertinent, a. relevant, apposite, applicable, proper.  Antonyms:  impertinent, irrelevant.

perturb, v. disquiet, excite, disturb, agitate, discompose, distress.

perturbation, n. excitement, agitation, discomposure, distress, disconcertion, worry.  Antonyms:  composure, imperturbation, calmness.

perturbed, a. excited, distressed, worried, discomposed, agitated.

perusal, n. reading.

peruse, v. read.

perverse, a. perverted, misdirected, erring, depraved, vitiated; intractable, obstinate, stubborn, contrary, headstrong, indocile.  Antonyms:  See obedient.

perversion, n. debasement, vitiation, corruption, falsification.