| enduring(adjective, calm, close, strong, complete) |
| unswerving(adjective, close, strong, tough, correct) |
| lasting(adjective, calm, strong, secure, strain) |
| loyal(adjective, good, close, strong, kind) |
| unfaltering(adjective, complete, firm, total, solid) |
| faithful(adjective, good, close, strong, kind) |
| fixed(adjective, move, calm, strong, complete) |
| immovable(adjective, move, secure, firm, solid) |
| inflexible(adjective, strong, secure, tough, flat) |
| invariable(adjective, calm, strong, secure, strain) |
| obdurate(adjective, strong, secure, tough, flat) |
| unflinching(adjective, strong, flat, firm, certain) |
| durable(adjective, calm, strong, secure, strain) |
| settled(adjective, strong, secure, easy, strain) |
| unalterable(adjective, calm, strong, secure, strain) |
| tenacious(adjective, clear, strong, secure, tough) |
| uncompromising(adjective, clear, secure, tough, severe) |
| dogged(adjective, strong, tough, firm, solid) |
| long-standing(adjective, strain, firmness, labour, hardiness) |
| persevering(adjective, strong, tough, flat, firm) |