| immovable(adjective, secure, firm, solid, determined) |
| indefatigable(adjective, strong, firm, determined, steady) |
| invariant(adjective, even, same) |
| monotonous(adjective, dull, regular, boring, fixed) |
| reliable(adjective, calm, good, close, strong) |
| trustworthy(adjective, good, close, strong, sound) |
| indestructible(adjective, tough, stable, sturdy, enduring) |
| level(adjective, calm, quiet, smooth, right) |
| repeated(adjective, dull, steady, stable, regular) |
| repetitive(adjective, continuous, repetitious) |
| solid(verb, adjective, calm, good, strong) |
| stubborn(adjective, secure, firm, determined, steady) |
| tenacious(adjective, strong, tough, flat, firm) |
| tireless(adjective, strong, firm, determined, steady) |
| ardent(adjective, close, kind, correct, keen) |
| connected(adjective, steady, fixed, persistent, continuous) |
| general(adjective, reasonable, common, ordinary, natural) |
| homogeneous(adjective, regular, fixed, persistent, even) |
| immortal(adjective, abundant, unrestrained, endless, everlasting) |
| obstinate(adjective, moderate, firm, determined, serious) |