The Greek prefix Cac-, Caco-, or Kak- means bad.

Cachexia = Bad Condition (of the mind or body).
Cacodemon = Bad Spirit.
Cacodoxy = Bad Opinion or Teachings.
Cacodyl = As(CH3)2, which has a Bad Smell.
Cacoepy = Bad Pronunciation.
Cacogenesis = Bad Breeding (of animals).
Cacography = Bad Spelling.
Cacology = Bad Choice of Words.
Caconym = A Taxonomic name that is Bad for Linguistic reasons.
Cacophonist = A Composer of cacophonous or atonal music.
Cacophonous = Harsh (bad) Sound.

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