"vagueness" in the noun sense
unclearness by virtue of being poorly expressed or not coherent in meaning
"the Conservative manifesto is a model of vagueness"
"these terms were used with a vagueness that suggested little or no thought about what each might convey"
indistinctness of shape or character
"the scene had the swirling vagueness of a painting by Turner"
Source: WordNet® (An amazing lexical database of English)
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