(1)讲(懂)道理的((of people)behaving in a fair and sensible way)：a～person 一个讲理的人;You will find him very～. 你会发现他很懂道理。be perfectly～in one's demands 自己的要求完全合情合理;〖同〗 understanding;〖反〗unreasonable;

(2)合情理的 (in accordance with reason;fair or logical)：a～solution/conclusion/suggestion/explanation/arrangement/demand/belief/sus-picion一个合理的解决办法/结论/建议/解释/安排/要求/信念/怀疑;Your proposal sounds～，but we'll have to talk about it further. 你的建议听上去很合理，但我们还要进一步讨论。It's～for young people to wear what they like. 年轻人有理由穿他们想穿的衣服。〖同〗sensible，rational，sound;〖反〗unreasonable，unsound;

(3)公平(道)的，可接受的((of price，etc)fair;correct;which one should or could accept)：a～price/fee/offer/claim 公道的价格/费用/开价/要求;My rent is～. 我的租金是很公道的。The tickets will cost a very～$30. 这些票只需花30美元，可以接受。〖同〗 fair，just;

(4)适当的，一般的(average;equal to what one might expect or want)[尤作attrib]：～weather/food/health/chance 尚好的天气/食品/健康状态/机会;There was a～number of people at the meeting. 到会的人数还可以。〖同〗moderate;

← reason n;

→′reasonableness n 讲道理;适当，一般;公平;′reasonably adv 讲道理地;一般地，适当地;公平地;

【辨异】reasonable与rational的区别见RATIONAL。