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Use "unclearness" in a sentence
"It is "doubtfulness or uncertainty of meaning or intention," or "Doubtfulness or uncertainty as regards interpretation," or "unclearness by virtue of having more than one meaning.""
"A proof that the openness of web 2.0 is not always well exploited is the unclearness of the posts above....."
"Meanwhile, I ask you to think for a moment about the word ‘ambiguity;’ (noun) an expression whose meaning cannot be determined from its context; unclearness, by virtue of having more than one meaning."