| stalwart | Loyal, reliable, and hardworking | |
| squelch | To forcefully silence or suppress someone or something | |
| squalid | Extremely dirty and unpleasant, especially as a result of poverty or neglect | |
| spurious | Not being what it purports to be; false or fake | |
| splenetic | Bad-tempered; spiteful | |
| spendthrift | a person who spends money in an extravagant, irresponsible way | |
| specious | Seemingly plausible, but actually wrong | |
| sparse | Thinly dispersed or scattered | |
| sparing | Given to or marked by the restrained and efficient use of resources; careful not to waste or be extravagant | |
| sovereign | A supreme ruler, especially a monarch. | |