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What Is The Meaning Of Nebulosity? 1 : the quality or state of being nebulous. 2 : nebulous matter also : nebula sense 1. What does Vituperous mean? Vituperous meaning (rare) Worthy of blame. Is nebulosity a word? noun, plural neb·u·los·i·ties. nebulous or nebular matter. a nebulous form, shape, or mass. How do you use