User blog comment:Ngh93/What REALLY makes a villain a Complete Monster?/@comment-25836248-20150327012402

a Complete Monster is a character that can not be redeemed and has no reason for their evil actions, it is a term even this wiki often gets wrong.. like how Alan Yates is continually added to Complete Monster despite being an anti-hero in the film who actually DOES have reasons for what he does.

a true Complete Monster is someone like, let's say, Syndrome, who has only a puny "excuse" and commits genocide over said puny "excuse" or Mandible from Antz, who is basically Hitler as an insect.