| justifiable(clear, sound, reasonable, sensible, rational) |
| kosher(clear, sound, reasonable, sensible, rational) |
| legit(clear, sound, reasonable, sensible, rational) |
| legitimate(adjective, clear, sound, reasonable, sensible) |
| lucid(clear, sound, reasonable, sensible, rational) |
| most likely(expression, clear, sound, reasonable, sensible) |
| necessary(clear, sound, reasonable, sensible, rational) |
| obtainable |
| obvious(clear, sound, reasonable, sensible, rational) |
| perceptive(clear, sound, reasonable, sensible, rational) |
| perspicuous(clear, sound, reasonable, sensible, rational) |
| pertinent(clear, sound, reasonable, sensible, rational) |
| plausible(clear, sound, reasonable, sensible, rational) |
| provable(adjective, understandable) |
| ratiocinative(adjective, clear, sound, logical) |
| rational(adjective, clear, sound, reasonable, sensible) |
| reasonable(adjective, sound, sensible, rational, probable) |
| relevant(clear, sound, reasonable, sensible, rational) |
| sensible(adjective, clear, sound, reasonable, rational) |
| sequential |