| Solution | Length | |
|---|---|---|
| 4 letters | ||
| iron | 4 | |
| 6 letters | ||
| strict | 6 | |
| 7 letters | ||
| adamant | 7 | |
| 8 letters | ||
| obdurate | 8 | |
| ironclad | 8 | |
| castiron | 8 | |
| 9 letters | ||
| hardnosed | 9 | |
| 11 letters | ||
| hardandfast | 11 | |
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