Related Clues:
- Like a solid argument
- Thinking
- Solidly based
- Like a well-armed fort
- Conforming to reason
- Sane and logical
- Sensible and logical
- Agreeable to reason
- Consistent with reason
- Thinking logically
- Based on reason
- Of argument, rational and defensible
- Logical and sensible
- Sensible, based on reason
- Reasonable, logical