| strenuous | Requiring or using great exertion or physical effort | |
| streamlined | Designed or organized to be efficient and easy to use | |
| stratagem | A plan, scheme, or trick for surprising or deceiving an enemy | |
| storied | Having a history; celebrated in history or legend. | |
| stolid | Having or expressing little or no sensibility; unemotional | |
| stilted | Speech or writing that is stiff and self-conscious, not natural or fluent | |
| stigmas | Marks of disgrace associated with a particular circumstance, quality, or person | |
| statuesque | Attractively tall and dignified, especially in a woman | |
| staple | A basic or principal element or feature | |
| stanch | To stop the flow of blood or other liquid | |