1
Vague concept
Expressed without enough precision for the idea to be understood consistently.
Example
The proposal offered only a nebulous description of success.
nebulous
/ˈnɛbjələs/ · NEB-yuh-luhsadjective
Vague, unclear, or insufficiently defined.
Use nebulous for an idea, goal, plan, or distinction whose shape or meaning remains difficult to identify precisely.
What nebulous Really Means
The word becomes easier to use when its closely related senses are separated and compared.
2
Ill-defined plan
Lacking concrete goals, steps, standards, or measurable outcomes.
Example
The committee supported the project, but its goals remained too nebulous to measure.
3
Unclear boundary
Having categories or limits that cannot be sharply distinguished.
Example
The boundary between the two artistic movements remains nebulous.
Use nebulous Naturally
Notice how the surrounding noun or clause reveals the exact shade of meaning.
The proposal offered only a nebulous description of success.
Because the policy's central terms were nebulous, departments applied it differently.
The memoir presents a nebulous chronology in which several years appear to overlap.
Precision Matters
Nebulous overlaps with several common words, but each carries a different emphasis.
nebulous
vs.Often suggests a concept has no clear shape or boundaries.
vague
Broadly means insufficiently specific.
nebulous
vs.May be too indistinct to support any precise interpretation.
ambiguous
Permits two or more distinct reasonable interpretations.
nebulous
vs.Lacks clear definition in itself.
obscure
May be difficult to understand because it is hidden, unfamiliar, or complex.
nebulous
vs.Criticises an idea's lack of definition or detail.
abstract
Describes an idea rather than a concrete object and is not necessarily unclear.
Test nebulous in Context
The term lacks the definition needed to create measurable standards.
1
Although the committee endorsed the initiative in principle, its description of ‘community benefit’ remained so nebulous that evaluators could not decide what outcomes to measure.
As used in the text, “nebulous” most nearly means…