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| Robust | strong; healthy; tough |
| Rotund | round |
| Ruminate | think over something; ponder |
| Ruse | trick; stratagem |
| Saccharin | falsely sweet |
| Sacrosanct | very holy; inviolable |
| Sagacious | wise |
| Sage | a wise person |
| Salacious | lecherous; erotic |
| Sallow | yellowish |
| Salubrious | health-giving |
| Salutary | something which teaches you a lesson; beneficial |
| Sanctimonious | hypocritically holy |
| Sanction | give approval to |
| Sanguinary | bloodthirsty; bloody |
| Sanguine | optimistic; cheerful |
| Sardonic | mocking |
| Savant | person with knowledge |
| Scale | to climb |
| Scapegoat | person on whom blame is placed for faults of others |