| Solution | Length | |
|---|---|---|
| 4 letters | ||
| hard | 4 | |
| nice | 4 | |
| 5 letters | ||
| rigid | 5 | |
| stern | 5 | |
| steep | 5 | |
| rough | 5 | |
| spiny | 5 | |
| undue | 5 | |
| tight | 5 | |
| tough | 5 | |
| 6 letters | ||
| trying | 6 | |
| strict | 6 | |
| uphill | 6 | |
| urgent | 6 | |
| rugged | 6 | |
| wicked | 6 | |
| taxing | 6 | |
| thorny | 6 | |
| severe | 6 | |
| subtle | 6 | |
| strait | 6 | |
| tricky | 6 | |
| 7 letters | ||
| onerous | 7 | |
| precise | 7 | |
| prudish | 7 | |
| refined | 7 | |
| spartan | 7 | |
| weighty | 7 | |
| 8 letters | ||
| PRESSING | 8 | |
| usurious | 8 | |
| puristic | 8 | |
| priggish | 8 | |
| TOILSOME | 8 | |
| arrogant | 8 | |
| punctual | 8 | |
| rigorous | 8 | |
| ticklish | 8 | |
| 9 letters | ||
| squeamish | 9 | |
| unfeeling | 9 | |
| selective | 9 | |
| spiraling | 9 | |
| stringent | 9 | |
| unsparing | 9 | |
| religious | 9 | |
| sensitive | 9 | |
| 10 letters | ||
| scrupulous | 10 | |
| 11 letters | ||
| punctilious | 11 | |
| UNWARRANTED | 11 | |
| puritanical | 11 | |
| prohibitive | 11 | |
| 12 letters | ||
| unreasonable | 12 | |
| skyrocketing | 12 | |
| preposterous | 12 | |
| 14 letters | ||
| superincumbent | 14 | |
| unconscionable | 14 | |