Here are some examples:
* Malfunction: A failure to function properly.
* Malnourished: Suffering from a lack of proper nutrition.
* Malicious: Intending to do harm.
* Malcontent: A person who is dissatisfied and rebellious.
* Malady: A disease or illness.
It's important to note that "mal" is not always used in a literal sense. Sometimes it can simply mean "wrong" or "incorrect," as in "malapropism" (a humorous misuse of words).