| Term | Definition |
| rancor | Bitter hatred or resentment |
| rankle | To cause anger or irritation |
| rapacious | Taking by force; done by greed |
| rapt | Deeply absorbed |
| rarefy | To make rare, scarce, or less dense |
| raze | To tear down; demolish |
| reactionary | Distinguished by conservatism, esp. in politics |
| recapitulate | To review with a brief summary |
| recidivism | A tendency to repeat a behavior, esp. criminal behavior |
| refract | To deflect sound or light |
| refute | To contradict or discredit |
| relegate | To banish; to send into exile |
| remission | A lessening of intensity or degree |
| remuneration | Payment for goods or services to pay back for losses |
| replete | Abundantly supplied; complete |
| repose | Relaxation; leisure |
| reprehensible | Deserving blame |
| reprove | To criticize or correct, usually in a gentle manner |
| requite | To return or repay a debt |
| rescind | To repeal, take back, cancel |
| resilient | Able to recuperate quickly after an illness or bad luck; able to bounce back |
| resolute | Marked by firm determination |
| resplendent | Brilliant; splendid |
| revile | To criticize with harsh, severe language; to verbally abuse |
| rhetoric | The art of speaking or writing effectively; skill in the effective manipulation and use of words |
| rife | Of abundant, common occurence; filled with |
| rostrum | An elevated platform used for public speaking |