Adjective
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lacking definition or definite content
"nebulous reasons"
"unfixed as were her general notions of what men ought to be"- Jane Austen
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of or relating to or resembling a nebula
"the nebular hypothesis of the origin of the solar system"
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lacking definite form or limits
"gropes among cloudy issues toward a feeble conclusion"- H.T.Moore
"nebulous distinction between pride and conceit"