cautious：是20秒记一个单词第525个cautious 

cautious/'kɔːʃəs/ adj. 小心的；谨慎的:点击收听音频跟读 ↓↓↓ ↓↓↓ ↓↓↓例句/词组:

He was very cautious about committing himself to anything.

他谨小慎微,从不轻易作出承诺。

英语解释：

being careful about what you say or do, especially to avoid danger or mistakes; not taking any risks 小心的；谨慎的: