reasonable

rational, reasonable, sensible

形容词 reasonable:

1. showing reason or sound judgment
   同义词：sensible
2. not excessive or extreme
   同义词：fair, fairish
3. marked by sound judgment
   同义词：sane

1. The management took all reasonable safety precautions.
   管理部门采取了一切合理的安全措施。
2. I think that's not reasonable.
   我认为这是没有道理的。
3. You are fortunate to have such a reasonable father.
   你有这样一位通情达理的父亲，真是幸运。
4. He gave me a reasonable explanation.
   他对我作了合理的解释。
5. My mother was always reasonable.
   我母亲一向通情达理。

rea.son.a.ble

adj.（形容词）
Capable of reasoning; rational:
通情达理的：能做理性判断的；理智的：
例句：
a reasonable person.
一个通情达理的人

Governed by or being in accordance with reason or sound thinking:
合理的；适当的：受理智或正确思维指导的，或与理智或正确思维一致的：
例句：
a reasonable solution to the problem.
这个问题的一个适当的解决办法

Being within the bounds of common sense:
过得去的：还在常理范围之中的：
例句：
arrive home at a reasonable hour.
在一个还说得过去的时刻回到了家

Not excessive or extreme; fair:
公道的；合理的：不过分或极端的；公道的：
例句：
reasonable prices.
公道的价格

【引伸】
rea.sonabil.ity 或
rea.sonableness
n.（名词）
rea.sonably
adv.（副词）