| A | B |
| malevolent | having bad feelings toward someone or something; spite, hatred |
| malapropism | a word used the wrong way |
| malicious | desiring harm to someone or something |
| malodorous | bad smelling |
| malady | a bad health condition; a disease |
| malaria | illness believed to be spread by bad air; actually spread by mosquitoes |
| malediction | bad speech; a curse |
| malefactor | one who does wrong; a villain |
| malignant | bad or harmful; producing death |
| malpractice | performing one's duty in a bad or wrong way |