| n. | 1. | Quality of being reasonable. |
| Noun | 1. | reasonableness - the state of having good sense and sound judgment; "his rationality may have been impaired"; "he had to rely less on reason than on rousing their emotions" Synonyms: rationality, reason |
| 2. | reasonableness - goodness of reason and judgment; "the judiciary is built on the reasonableness of judges" | |
| 3. | reasonableness - the property of being moderate in price; "the store is famous for the reasonableness of its prices" Synonyms: moderateness, modestness | |
| 4. | reasonableness - moderation in expectations; "without greater reasonableness by both parties we will never settle this matter!" | |
| 5. | reasonableness - the quality of being plausible or acceptable to a reasonable person; "he questioned the tenability of my claims" Synonyms: tenability, tenableness |