1. State of being doubtful.
2. Uncertainty of meaning; ambiguity; indefiniteness. “ The doubtfulness of his expressions.”
3. Uncertainty of event or issue.
n 1: the state of being unsure of something [syn: doubt, uncertainty,
incertitude, dubiety, dubiousness] [ant: certainty]
2: uncertainty about the truth or factuality of existence of
something; "the dubiousness of his claim"; "there is no
question about the validity of the enterprise" [syn: doubt,