* As an adjective: attentif (masculine) or attentive (feminine)
* As an adverb: attentivement
Here are some examples:
* "Be careful!" - "Faites attention !"
* "She is a careful driver." - "Elle est une conductrice attentive."
* "He answered carefully." - "Il a répondu attentivement."
You can also use other words depending on the specific meaning of "careful," such as:
* prudent (cautious)
* méticuleux (meticulous)
* soigneux (thorough)
* précautionneux (precautionary)