Question: what are words with the prefix mal?
Answer: Mala fide: Doing something in bad faith, in an attempt to deceive someone.
Malabsorption: Bad absorption of food.
Maladjusted: A bad ability to adjust to a social environment.
Malaise: A general state of feeling badly; sickness.
Malign: Evil-natured.
Malefactor: Evildoer.
Malady: Bad disease.