Antonyms of SURE

Examples of usage:

  1. And yet it were not to be sure of this.... "A Fool There Was" by Porter Emerson Browne
  2. I am sure you would rather be alone! "Okewood of the Secret Service" by Valentine Williams
  3. The more I care, the more sure. "The Port of Adventure" by Charles Norris Williamson and Alice Muriel Williamson
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