| defensible(adjective, attack, sound, reasonable, rational) |
| tenable(adjective, attack, sound, reasonable, rational) |
| justifiable(adjective, sound, reasonable, rational, defended) |
| maintainable(adjective, sound, reasonable, rational, defended) |
| supportable(adjective, defended, conceivable, tenable, verbal attack) |
| arguable(adjective, sound, reasonable, rational, conceivable) |
| impregnable(adjective, sound, reasonable, rational) |
| invulnerable |
| unassailable |
| believable(adjective, sound, reasonable, rational, conceivable) |
| conceivable(adjective, tenable) |
| condonable(adjective, sound, reasonable, rational) |
| credible(adjective, sound, reasonable, rational, conceivable) |
| excusable(adjective, sound, reasonable, rational) |
| imaginable(adjective, conceivable, tenable) |
| plausible(adjective, sound, reasonable, rational) |
| rational(adjective, sound, reasonable, conceivable, tenable) |
| reasonable(adjective, sound, rational, conceivable, tenable) |
| viable(adjective, sound, reasonable, rational, conceivable) |
| vindicable(adjective, sound, reasonable, rational) |