cautious

careful, cautious, attentive, prudent

这些形容词均含有“小心的，谨慎的”之意。
careful: 侧重做事谨慎、留心，特别注意一些细节地方。
cautious: 着重考虑事情的后果，谨慎留意，防止出差错。
attentive: 指认真地注意地倾听别人的意见，留心别人的需要等。
prudent: 指遇事审慎，思考计划周密，不贸然行事。

名词 cautious:

1. people who are fearful and cautious
   同义词：timid

形容词 cautious:

1. showing careful forethought
2. avoiding excess
   同义词：conservative
3. cautious in attitude and careful in actions; prudent

1. Felt a cautious optimism that the offer would be accepted.
   怀着提议将被接受的谨慎的乐观情绪
2. Cautious in spending money; frugal.
   节俭的使用钱财时谨慎的; 节俭的
3. She is cautious of telling secrets.
   她很谨慎，不会泄露秘密。
4. He is cautious in his choice of words.
   他措辞很谨慎。

cau.tious

adj.（形容词）
Showing or practicing caution; careful.
谨慎的：表现或做事谨慎的；小心认真的
Tentative or restrained; guarded:
防范的：实验的或有节制的；防范的：
例句：
felt a cautious optimism that the offer would be accepted.
怀着提议将被接受的谨慎的乐观情绪

【引伸】
cau.tiously
adv.（副词）
cau.tiousness
n.（名词）