| Answer | Crossword Clue |
|---|---|
| OSSIFY | Become rigid and inflexible |
| ossify | to become rigid or inflexible in habits, attitudes, opinions, etc. |
| hidebound | narrow and rigid in opinion; inflexible. |
| ironclads | very rigid or exacting; inflexible; unbreakable |
| ironclad | very rigid or exacting; inflexible; unbreakable |
| tramlined | running, or as if running, in tramlines, rigid, inflexible |
