What does nebulosity mean?
Nebulosity is a formal noun for the condition of being nebulous: vague, indistinct, clouded over, or difficult to define. Writers often use it to describe language, ideas, motives, or situations that lack clear contours. For example, the nebulosity of a contract may make its obligations difficult to understand, while the nebulosity of a plan may suggest that its details have not been thought through. The word has a somewhat elevated or critical tone and is less common than straightforward alternatives such as vagueness or uncertainty. In astronomy, nebulosity can also denote diffuse, cloud-like matter or a luminous region associated with a nebula. Its imagery is evocative because it connects intellectual obscurity with the physical obscuring effect of mist or clouds.
nounThe state of being nebulous, especially of being vague, indistinct, or difficult to understand. In astronomy, it can also refer to a diffuse cloud or cloud-like mass of matter.
- The quality of being vague, obscure, or insufficiently defined.
- A diffuse cloud or cloud-like mass, especially in astronomy.
"The proposal was dismissed because of the nebulosity of its central claims."
"The committee struggled with the nebulosity of the proposal."
"The telescope revealed a region of stellar nebulosity in the distant nebula."
Plural form is used for multiple instances of vagueness or for multiple diffuse astronomical regions.
"The report acknowledged the nebulosities surrounding the original estimates."
Nebulosity preserves the image of a cloud in the sky: just as mist obscures a landscape, a nebulous idea obscures meaning.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does nebulosity come from?
The word comes through Latin from nebula, meaning cloud or mist, and ultimately relates to the same Latin family as nebulous and nebular. The Latin noun nebulositas referred to cloudiness or mistiness and was later developed into English nebulosity with both figurative and astronomical associations. The word's history preserves the basic metaphor of a cloud making the outline of something unclear.
Related word forms
How nebulosity is actually used
The word is formal and relatively uncommon in everyday speech. Its figurative use is more common than its specialized astronomical use.
Easily confused with nebulosity
A nebula is a physical cloud or luminous region in space, whereas nebulosity is the quality of being diffuse, cloud-like, or vague.