| normal(adjective, even, rigid, inflexible, reliable) |
| numbed(adjective, hard, firm, solid, tense) |
| of a piece(expression, adjective, idiom, even, rigid) |
| on hold(expression, adjective, dull, idle, sluggish) |
| opaque(adjective, set, solid, heavy, deep) |
| ordered(adjective, normal, even, rigid, inflexible) |
| orderly(adjective, even, rigid, inflexible, reliable) |
| ossicular |
| ossiferous |
| ossify |
| osteal |
| out of action(expression, adjective, idiom, dull, idle) |
| out of commission(expression, adjective, idiom, dull, idle) |
| out of service(expression, adjective, idiom, dull, idle) |
| out of work(expression, adjective, idiom, dull, idle) |
| passive(dull, sluggish, lazy, motionless, unmoving) |
| pertinacious(adjective, determined, resolute, uncompromising, unshakeable) |
| perverse(adjective, determined, resolute, uncompromising, unshakeable) |
| pigheaded(adjective, determined, resolute, uncompromising, unshakeable) |
| plumb(adjective, even, rigid, inflexible, reliable) |