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Noun: dubiousness  d(y)oo-bee-us-nus
  1. The state of being unsure of something
    - doubt, uncertainty, incertitude, dubiety, doubtfulness
  2. Uncertainty about the truth, factuality or existence of something
    "the dubiousness of his claim";
    - doubt, doubtfulness, question

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