| normal(adjective, even, rigid, inflexible, reliable) |
| obstinate(moderate, firm, cautious, conventional, timid) |
| recurrent(adjective, dull, steady, boring, persistent) |
| repetitive(adjective, dull, steady, boring, persistent) |
| resolved |
| settled(adjective, strong, firm, solid, determined) |
| solid(adjective, severe, firm, harsh, certain) |
| standard |
| staunch(adjective, close, correct, firm, honest) |
| straight(adjective, close, smooth, correct, right) |
| strict(adjective, close, correct, severe, harsh) |
| strong(adjective, firm, steady, even, unyielding) |
| sustained(adjective, persistent, constant, continuous, endless) |
| systematic(adjective, calm, smooth, steady, temperate) |
| tedious |
| timeless |
| unaltered(adjective, uniform, unchanged) |
| unbending |
| undying(adjective, continuous, enduring, lasting, permanent) |
| unfaltering(adjective, set, clear, strong, firm) |