cautious
adjective
uk/ˈkɔːʃəs/ usvery careful about what you do or say and unwilling to take risks because you want to avoid possible problems:
be cautious about sth/about doing sth Businesses have become cautious about spending on technology.
a cautious approach/strategy He said the group would continue its cautious approach to expanding in Japan until it better understood the market.
cautious optimism
a feeling that you can be hopeful about a situation although you realize that there still could be problems:
There is cautious optimism for a successful outcome for the financial year.
cautiously
adverb
Textile and garment companies in China reacted cautiously to the announcement.