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Wordnet 3.0

NOUN (2)

1. the state of being unsure of something;
[syn: doubt, uncertainty, incertitude, dubiety, doubtfulness, dubiousness]

2. uncertainty about the truth or factuality or existence of something;
- Example: "the dubiousness of his claim"
- Example: "there is no question about the validity of the enterprise"
[syn: doubt, dubiousness, doubtfulness, question]


The Collaborative International Dictionary of English v.0.48:

Doubtfulness \Doubt"ful*ness\, n. 1. State of being doubtful. [1913 Webster] 2. Uncertainty of meaning; ambiguity; indefiniteness. " The doubtfulness of his expressions." --Locke. [1913 Webster] 3. Uncertainty of event or issue. --Bacon. [1913 Webster]
WordNet (r) 3.0 (2006):

doubtfulness n 1: the state of being unsure of something [syn: doubt, uncertainty, incertitude, dubiety, doubtfulness, dubiousness] [ant: certainty] 2: uncertainty about the truth or factuality or existence of something; "the dubiousness of his claim"; "there is no question about the validity of the enterprise" [syn: doubt, dubiousness, doubtfulness, question]