| long-standing(adjective, strain, firmness, labour, hardiness) |
| settled(adjective, strain, firmness, labour, hardiness) |
| stabile(adjective, strain, firmness, persistent, continuous) |
| unalterable(adjective, strain, firmness, persistent, continuous) |
| supported(verb, adjective, constant, established, defended) |
| maintained(verb, adjective, constant, safe, received) |
| continued(verb, adjective, great, spread, deep) |
| continuous(adjective, persistent, constant, unyielding, endless) |
| uninterrupted(adjective, persistent, constant, continuous, endless) |
| long(adjective, time, great, deep, boring) |
| prolonged(verb, adjective, great, slow, deep) |
| unceasing(adjective, persistent, constant, continuous, endless) |
| upheld(verb, adjective, supported, defended, assisted) |
| continual(adjective, persistent, constant, continuous, endless) |
| held |
| abetted(verb, aided, assisted) |
| backed(verb, adjective, constant, promoted, continued) |
| ceaseless(adjective, persistent, constant, continuous, endless) |
| extended(verb, adjective, spread, advanced, extensive) |
| interminable(adjective, slow, persistent, late, continuous) |