Antonyms of REQUIRED

Examples of usage:

  1. She had animal spirits in plenty, and it needed an effort for her to keep them down, while Carrington's spirits were nearly exhausted after twenty years of strain, and he required a greater effort to hold himself up. "Democracy An American Novel" by Henry Adams
  2. Only the day before he had concluded on his own account a deal, that cost him much thought and required an extra amount of a certain kind of courage, with a Wall Street firm. "Flamsted quarries" by Mary E. Waller
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