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Pessimal
  • /pes'im-l/ adj. [Latin-based antonym for `optimal'] Maximally bad. "This is a pessimal situation. " Also `pessimize' vt. To make as bad as possible. These words are the obvious Latin-based antonyms for `optimal' and `optimize', but for some reason they do not appear in most English dictionaries, although `pessimize' is listed in the OED.