adj

• (mathematics) Highly sensitive to starting conditions, so that a small change to them may yield a very different outcome.
  "The manipulation of the environment through design involves many branches of mathematics: the projective geometry of light transmission, the chaotic and probabilistic maths of weather patterns, and the statistical algorithms required to make analysis legible and obtain discrete building components from continuous distributions."
• (roleplaying games) Aligned against following or upholding laws and principles.
  "While a player in Advanced Dungeons & Dragons is required to properly perform one of nine moral categories (e.g., "lawful good" or "chaotic neutral"), the Everway player is expected to perform the literary equivalent of moral themes. It is easy to imagine a Macbeth Everway character with the fault of ambition or King Solomon with the virtue of wisdom. It is, however, an additional step removed—and therefore seemintly more contrived—to imagine Macbeth as "chaotic neutral," "neutral evil," or "lawful neutral.""

noun

• (roleplaying games) A character having a chaotic alignment.