Here are some examples of how to use it:
* Le lion est dangereux. (The lion is dangerous.)
* Cette route est dangereuse la nuit. (This road is dangerous at night.)
* Il y a des animaux dangereux dans cette forêt. (There are dangerous animals in this forest.)
It's important to note that the word "dangerous" can also be used in a more metaphorical sense, to describe something that is risky or harmful in some way. For example, you might say:
* C'est une situation dangereuse. (It's a dangerous situation.)
* Ce projet est dangereux pour l'entreprise. (This project is dangerous for the company.)