| slip-up(slip, fault, mistake) |
| small(weak, poor, insufficient, scarce) |
| small difficulty(expression, control, check, limit, condition) |
| speck(noun, weakness, crack, fault, failing) |
| spot(noun, difficulty, weakness, crack, fault) |
| stain(noun, weakness, crack, fault, failing) |
| sterile(weak, poor, insufficient, scarce) |
| stint(control, check, limit, condition, restraint) |
| stinted(weak, poor, insufficient, scarce) |
| stop |
| stoppage(noun, delay, difficulty, obstacle, obstruction) |
| stricture(control, check, limit, condition, restraint) |
| stumbling block(noun, expression, control, check, difficulty) |
| stunted(weak, poor, insufficient, scarce) |
| thin(weak, poor, insufficient, scarce) |
| too little(expression, adjective, weak, poor, insufficient) |
| trammel(noun, difficulty, obstacle, obstruction, impediment) |
| unproductive(weak, poor, insufficient, scarce) |
| unqualified(weak, poor, insufficient, scarce) |
| vice(noun, weakness, crack, fault, failing) |