cautious               
adjective uk/ˈkɔː.ʃəs/ us/ˈkɑː.ʃəs/
B2 谨慎的,细心的,小心翼翼的
Someone who is cautious avoids risks.
  He's a cautious driver. 他开车很小心。 
 B2 经过仔细考虑的,斟酌过的
A cautious action is careful, well considered, and sometimes slow or uncertain.
  a cautious approach 谨慎的方式 
 cautious criticism 小心谨慎的批评 
 cautious optimism 审慎的乐观态度
a feeling that there are some reasons to hope for a good result, even if you do not expect complete success or improvement
 - More examples
 - The prime minister was extremely cautious, saying nothing inflammatory and giving no hostages to fortune.
 - Judging from your exam results, I think you have cause for cautious optimism about getting a university place.
 - Their supporters gave the decision a cautious welcome.
 - He is too cautious to be a great leader.
 - I think you should be cautious about trying to change their views.
 
cautiously
adverb uk/ˈkɔː.ʃəs.li/ us/ˈkɑː.ʃəs.li/
 谨慎地,小心翼翼地
in a cautious way