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Noun: doubtfulness  dawt-ful-nus
  1. The state of being unsure of something
    - doubt, uncertainty, incertitude, dubiety, dubiousness
  2. Uncertainty about the truth, factuality or existence of something
    "the doubtfulness of his claim";
    - doubt, dubiousness, question

Type of: cognitive state, precariousness, state of mind, uncertainness, uncertainty