| prominent | Standing out so as to be easily seen; important or well-known | |
| prolix | Using or containing too many words; tediously lengthy | |
| prolific | Producing much fruit or foliage or many offspring | |
| proliferate | To increase rapidly in numbers; multiply. | |
| prognosticate | To predict or foretell a future event | |
| progenitor | A person or thing from which a person, animal, or plant is descended or originates; an ancestor or parent | |
| profuse | Spending or giving freely and in large amount, often to excess | |
| profound | Very great or intense, especially in terms of emotion or thought | |
| profane | Relating to or showing disrespect or contempt for sacred things | |
| prodigious | Remarkably or impressively great in extent, size, or degree | |