Sinister  

Adjective | sin-uh-ster
seeming evil or dangerous; making you feel that something bad will happen

Potent  

Adjective | poht-nt
having a strong, chemical effect

Postulate  

Verb | pos-chuh-leyt
to suggest or accept that something is true so that it can be used as the basis for a theory, etc.

Plausible  

Adjective | plaw-zuh-buhl
reasonable and possibly true

Pitiable  

Adjective | pit-ee-uh-buhl
deserving pity

Pinnacle  

Noun | pin-uh-kuhl
highest level or degree

Petulant  

Adjective | pech-uh-luhnt
cranky, pouty, irritable

Persecute  

Verb | pur-si-kyoot
.to treat somebody in a cruel and unfair way, especially because of race, religion or political beliefs