名詞 reasonableness:

1. the state of having good sense and sound judgment
   同義詞：rationality, reason
2. goodness of reason and judgment
3. the property of being moderate in price or expenditures
   同義詞：moderateness, modestness
4. moderation in expectations
5. the quality of being plausible or acceptable to a reasonable person
   同義詞：tenability, tenableness

1. I had to grant the reasonableness of his argument.
   我必須承認他的論點有道理。