| substantial(adjective, calm, strong, secure, strain) |
| unalterable(adjective, calm, strong, secure, strain) |
| long-standing(adjective, strain, firmness, labour, hardiness) |
| settled(adjective, strain, firm, solid, stable) |
| sustained(adjective, strain, firmness, persistent, continuous) |
| unyielding(adjective, strain, firmness, labour, hardiness) |
| immovable(adjective, firm, solid, still, stable) |
| equable(adjective, calm, strong, secure, firm) |
| even(adjective, calm, strong, secure, smooth) |
| unchanging(adjective, calm, smooth, right, flat) |
| immoveable |
| static(adjective, still, fixed, motionless, stationary) |
| dead in the water |
| immobile(adjective, still, passive, motionless, stationary) |
| unmovable |
| uniform(adjective, calm, strong, secure, smooth) |
| unvarying(adjective, calm, strong, secure, smooth) |
| abiding(adjective, calm, strong, secure, firm) |
| fixed(adjective, dull, firm, solid, still) |
| motionless(adjective, still, passive, stationary, changeless) |