| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Nettlesome | 10 | 6 | 4 | 3 |
| Never Ending | 12 | 8 | 4 | 4 |
| Never Idle | 10 | 6 | 4 | 4 |
| Not Easy | 8 | 5 | 3 | 3 |
| No Picnic | 9 | 6 | 3 | 3 |
| Obdurate | 8 | 4 | 4 | 3 |
| Obstinate | 9 | 5 | 4 | 3 |
| Onerous | 7 | 3 | 4 | 3 |
| Operose | 7 | 3 | 4 | 3 |
| Oppressive | 10 | 6 | 4 | 3 |
| Overworked | 10 | 6 | 4 | 3 |
| Painful | 7 | 4 | 3 | 2 |
| Painstaking | 11 | 7 | 4 | 3 |
| Penal | 5 | 3 | 2 | 2 |
| Penological | 11 | 6 | 5 | 5 |
| Perpetual | 9 | 5 | 4 | 4 |
| Persistent | 10 | 7 | 3 | 3 |
| Pertinacious | 12 | 6 | 6 | 4 |
| Pesky | 5 | 4 | 1 | 2 |
| Pestering | 9 | 6 | 3 | 3 |
| Pestiferous | 11 | 6 | 5 | 4 |
| Plaguey | 7 | 4 | 3 | 2 |
| Plaguy | 6 | 4 | 2 | 2 |
| Ponderous | 9 | 5 | 4 | 3 |
| Prickly | 7 | 6 | 1 | 2 |
| Problematic | 11 | 7 | 4 | 4 |
| Problematical | 13 | 8 | 5 | 5 |
| Punishable | 10 | 6 | 4 | 4 |
| Punishing | 9 | 6 | 3 | 3 |
| Punitive | 8 | 4 | 4 | 3 |
| Punitory | 8 | 5 | 3 | 4 |
| Putting To Death | 16 | 11 | 5 | 4 |
| Quelling | 8 | 5 | 3 | 2 |
| Recondite | 9 | 5 | 4 | 3 |
| Redoubtable | 11 | 6 | 5 | 4 |

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