The smart villains are diabolical geniuses, except for one or two fatal misjudgments, often from pride or mental illness. Villains who are clearly dumb are those who set bombs that include a long timer showing the time before explosion, and color coded wires that will be cut by the hero seconds before detonation. The hidden villains are the wolves in sheep's clothing, the stunningly hesitant talkers on the good side who telegraph they are hiding something.
Open villains are obviously easy to identify.
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