| enduring(adjective, calm, close, strong, sound) |
| even(verb, adjective, adverb, calm, quiet) |
| lasting(adjective, calm, strong, secure, strain) |
| substantial(adjective, calm, strong, sound, secure) |
| tight(adjective, close, strong, secure, strain) |
| stout(adjective, calm, strong, sound, tough) |
| rigid(adjective, feature, state, characteristic, complete) |
| sweetheart(noun, person, love, informal, call) |
| calm(verb, adjective, characteristic, quiet, fix) |
| loyal(adjective, good, close, strong, correct) |
| stabile(adjective, calm, strong, secure, smooth) |
| stationary(adjective, move, strain, firmness, labour) |
| unfaltering(adjective, strong, complete, firm, total) |
| fixed(adjective, adverb, move, strong, sound) |
| long-standing(adjective, strain, firmness, labour, hardiness) |
| seamless(adjective, strain, firmness, uniform, continuous) |
| unchanging(adjective, calm, close, quality, smooth) |
| uniform(adjective, calm, quiet, strong, secure) |
| unvarying(adjective, calm, quiet, quality, strong) |
| sustained(adjective, strain, firmness, persistent, continuous) |