pleasing reveries

pleasurable excitement

plenary argument

plentiful harvest

plighted word             [plighted = promised by a solemn pledge]

poignant clearness

pointless tale

poisonous counsels

polished ease

polite indifference

political malcontent

polluting taints

pompous platitudes

ponderous research

pontifical manner

popular resentment

populous fertility

portentous gulf

positively deteriorating

posthumous glory

potential energy

powerful stimulant

practical helpfulness

precarious path

precautionary measure

precipitous flight

precise purpose

precocious wisdom

preconceived view

predatory writers

predestined spinster

predominant habit

pregnant hint

preliminary assumption

premature ripening

premonitory symptoms

preoccupied attention

prepossessing appearance

preposterous assertion

prescient reflection
   [prescient = perceiving the significance of events before they occur]

prescribed conditions

presiding genius

pressing necessity

pretended surprise

pretentious dignity

preternatural sagacity      [preternatural = extraordinary]
                            [sagacity = farsighted; wise]

pretty plaintiveness

prevailing misconception

priestly austerity

primal energy

prime factor           [no integer factors; irreducible; 1,2,3,5,7,11...]

primeval silence

primordial conditions