Here are some synonyms for "cautious":
* Careful
* Prudent
* Wary
* Circumspect
* Hesitant
* Apprehensive
Examples:
* "He was cautious about investing his money in the stock market."
* "The hikers proceeded cautiously along the treacherous mountain path."
* "She was cautious in her choice of words, afraid of offending anyone."
Note: The opposite of "cautious" is reckless, rash, or impulsive.