perceptible (adj.)

cognizable; discernible; perceivable

pernicious (adj.)

tending to kill or hurt

perverse (adj.)

unreasonable

pestilent (adj.)

having a malign influence or effect

petulant (adj.)

unreasonably irritable or ill-tempered

priggish (adj.)

conceited

proficient (adj.)

possessing ample and ready knowledge or of skill in any art, science, or industry

prolix (adj.)

using or containing a great and usually an excessive number of words; wordy

prosaic (adj.)

unimaginative

pusillanimous (adj.)

without spirit or bravery

redoubtable (adj.)

worthy of respect or honor

remiss (adj.)

negligent

resilient (adj.)

having the quality of springing back to a former position

resplendent (adj.)

very bright

reticent (adj.)

habitually keeping silent or being reserved in utterance

retroactive (adj.)

operative on, affecting, or having reference to past events, transactions, responsibilities

risible (adj.)

capable of exciting laughter

robust (adj.)

characterized by great strength or power of endurance

sapient (adj.)

possessing wisdom

sardonic (adj.)

scornfully or bitterly sarcastic

somnolent (adj.)

sleepy