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WORDNET DICTIONARY

Noun doubtfulness has 2 senses

• doubtfulness(n = noun.cognition) doubt, dubiety, dubiousness, incertitude, uncertainty - the state of being unsure of something; Array
is a kind of cognitive state, state of mind
has particulars: arriere pensee, mental reservation, reservation, distrust, misgiving, mistrust, suspicion, disbelief, incredulity, mental rejection, skepticism, indecision, indecisiveness, irresolution, peradventure, suspense
Derived forms adjective doubtful₂, adjective doubtful₃

• doubtfulness(n = noun.attribute) doubt, dubiousness, question - 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"
is a kind of precariousness, uncertainness, uncertainty
Derived form adjective doubtful₁

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doubtfulness

Uncertainty

N uncertainty, incertitude, doubt, doubtfulness, dubiety, dubitation, dubitancy, dubitousness, hesitation, suspense, perplexity, embarrassment, dilemma, bewilderment, timidity, vacillation, diaporesis, indetermination, vagueness, haze, fog, obscurity, ambiguity, contingency, dependence, dependency, double contingency, possibility upon a possibility, open question, onus probandi, blind bargain, pig in a poke, leap in the dark, something or other, needle in a haystack, needle in a bottle of hay, roving commission, precariousness, fallibility, uncertain, casual, random, changeable, doubtful, dubious, indecisive, unsettled, undecided, undetermined, in suspense, open to discussion, controvertible, in question, vague, indeterminate, indefinite, ambiguous, equivocal, undefined, undefinable, confused, mystic, oracular, dazed, perplexing, enigmatic, paradoxical, apocryphal, problematical, hypothetical, experimental, unpredictable, unforeseeable (unknowable), fallible, questionable, precarious, slippery, ticklish, debatable, disputable, unreliable, untrustworthy, contingent, contingent on, dependent on, subject to, dependent on circumstances, occasional, provisional, unauthentic, unauthenticated, unauthoritative, unascertained, unconfirmed, undemonstrated, untold, uncounted, in a state of uncertainty, in a cloud, in a maze, bushed, off the track, ignorant, afraid to say, out of one's reckoning, astray, adrift, at sea, at fault, at a loss, at one's wit's end, at a nonplus, puzzled, lost, abroad, d_esorient_e, distracted, distraught, pendente lite, sub spe rati, Heaven knows, who can tell? who shall decide when doctors disagr.

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