Mal, male = abnormal, worse

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Across
  1. 1. bad smell; stinky
  2. 2. mischief; evil intent; bad will
  3. 3. depressing; causing gloom or misery
  4. 5. harmful
  5. 8. misconduct or wrongdoing
  6. 9. word that describes a person who wishes bad things would happen to others
Down
  1. 1. bad health; illness; sickness
  2. 4. having bad health or having poor nutrition
  3. 6. a disease usually spread by infected mosquitoes
  4. 7. an evildoer; a person who does bad things