Ant. Transient, brief, fleeting, evanescent, passing, transitory, momentary, temporary, ephemeral.
Permission. Authority, allowance, consent, liberty, leave, license, permit, authorization.
Ant. Hindrance, opposition, objection, denial, prevention, prohibition, refusal, resistance.
Pernicious. Mischievous, baneful, destructive, noisome, deleterious, harmful, hurtful, poisonous, noxious, pestilential, unhealthful, unwholesome, detrimental, deadly, evil, foul, injurious, insalubrious, pestiferous, perverting, ruinous.
Ant. Helpful, invigorating, salutary, advantageous, good, favorable, life-giving, rejuvenating, useful, serviceable, beneficent, wholesome, beneficial, healthful.
Perpetual. Continual, endless, unceasing, unfailing, incessant, constant, eternal, everlasting, perennial, permanent, enduring.
Ant. Periodic, transient, recurrent, temporary, occasional, casual, momentary.
Perplex. Entangle, involve, complicate, embarrass, puzzle, bewilder, confuse, distract, annoy, confound, trouble, worry, disturb, pester, bother, mystify.
Ant. Enlighten, clear, explicate, simplify, elucidate, illumine, unfold, explain, manifest, calm, quiet, control, please, instruct, solve, illustrate, make intelligible, account for.
Perplexity. Confusion, bewilderment, disturbance, distraction, doubt, embarrassment, astonishment, amazement.