| Term | Definition |
| dismal (adj) | depressing: causing gloom or misery: causing bad feelings |
| malady (n) | bad health; illness; sickness |
| malaria (n) | bad air; a disease usually spread by infected mosquitoes |
| malefactor (n) | an evildoer; a person who does bad things |
| malevolent (adj) | a word that describes a person or character who wishes bad things would happen to others |
| malfeasanse (n) | wrongdoing or bad conduct by a public offical |
| malice (n) | mischief; evil intent; bad will |
| malignant (adj) | harmful; something bad enough that it could result in death when related to cancer |
| malnourished (adj) | having bad health or having poor nutrition |
| malodorous (adj) | bad smell; stinky |