| unobjectionable(adjective, respectable, bearable, maintainable) |
| justifiable(adjective, unbroken, verifiable, provable) |
| incessant(adjective, respectable, bearable, maintainable) |
| verifiable(adjective, continuous, unbroken, incessant, provable) |
| evincible(adjective, respectable, bearable, maintainable) |
| worthwhile(adjective, respectable, bearable, maintainable) |
| enduring(adjective, strong, hard, firm, steady) |
| environmentally sound(expression, good, environment, clean, healthy) |
| persistent(adjective, firm, steady, stable, fixed) |
| rational(adjective, respectable, bearable, conceivable, tenable) |
| empirical(adjective, unbroken, verifiable, provable) |
| stabile(adjective, firm, steady, stable, fixed) |
| staunch(adjective, strong, hard, stable, stability) |
| sturdy(adjective, strong, hard, stable, stability) |
| sustained(adjective, firm, steady, stable, fixed) |
| unfluctuating(adjective, firm, steady, stable, fixed) |
| balanced(adjective, balance, steady, poised) |
| conservational(adjective, state, characteristic, position) |
| ecologically sound(expression, environment, healthy, ecologic) |
| endurant(adjective, firm, steady, stable, fixed) |