Words with "mal-" and their definitions:
* Maladjusted: Unable to cope with the demands of everyday life; poorly adjusted.
* Malady: A disease or illness.
* Malaria: A mosquito-borne disease that causes fever, chills, and sweating.
* Malcontent: A person who is habitually dissatisfied or rebellious.
* Malfeasance: Wrongdoing, especially by a public official.
* Malformation: An abnormal structure or shape, often due to a birth defect.
* Malice: Intention to harm or injure another.
* Malignant: Tending to become worse and cause death; harmful.
* Malnutrition: A condition caused by a lack of essential nutrients in the diet.
* Malpractice: Negligence or misconduct by a professional person.
* Maltreated: Treated badly or cruelly.
* Malversation: Misconduct or dishonesty, especially by a person in a position of trust.
* Maltreat: To treat badly or cruelly.
* Malodorous: Having an unpleasant smell.
Other words with "mal-" (less common):
* Malapropos: Inappropriate or untimely.
* Malapropism: A humorous misuse of words.
* Malevolent: Having or showing a wish to do evil to others.
It's important to note that some words with "mal-" have slightly different nuances in their meanings, but generally, they all relate to something negative or undesirable.