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say it: NEH-byuh-luhs
nebulous is an adjective meaning "lacking definite form or limits". It carries 3 recorded senses.
lacking definite form or limits
“gropes among cloudy issues toward a feeble conclusion”
“nebulous distinction between pride and conceit”
of or relating to or resembling a nebula
“the nebular hypothesis of the origin of the solar system”
astronomy
lacking definition or definite content
“nebulous reasons”
“unfixed as were her general notions of what men ought to be”
Definitions, synonyms and semantic relations for nebulous come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.