Longman Dictionary of Contemporary English homepage

nebulous

 adjective
     
neb‧u‧lous formal
1 an idea that is nebulous is not at all clear or exact [= vague]:
'Normality' is a rather nebulous concept.
2 a shape that is nebulous is unclear and has no definite edges:
a nebulous ghostly figure
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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