| persistent(adjective, strong, firm, intense, deliberate) |
| pertinacious(adjective, firm, energetic, determined, vigorous) |
| pigheaded(adjective, set, firm, determined, usual) |
| pitiless(adjective, harsh, cruel, determined, fierce) |
| playing hard ball(expression, adjective, idiom, intense, deliberate) |
| poignant(adjective, severe, stiff, tight, strict) |
| positive(adjective, intense, certain, deliberate, determined) |
| powerful(adjective, severe, stiff, tight, strict) |
| prearranged(adjective, firm, determined, usual, regular) |
| predetermined(adjective, firm, determined, usual, regular) |
| prescribed(adjective, firm, determined, usual, regular) |
| prevailing(adjective, strong, certain, definite, disciplined) |
| purposeful(adjective, firm, determined, bold, serious) |
| purposive(adjective, intense, deliberate, determined, resolute) |
| refractory(adjective, firm, determined, fixed, stubborn) |
| regular(adjective, firm, solid, determined, usual) |
| relentless(adjective, energetic, cruel, determined, vigorous) |
| remorseless(adjective, harsh, cruel, determined, fierce) |
| resolved(adjective, strong, flat, firm, certain) |
| rigorous(adjective, severe, harsh, cruel, determined) |