The bustling swarm had swept the sky in a scattered and uniform haze, which now thickened to a nebulous centre: this glided on to a bough and grew still denser, till it formed a solid black spot upon the light.
When the autumn sun slanted over Greenhill this morning and lighted the dewy flat upon its crest, nebulous clouds of dust were to be seen floating between the pairs of hedges which streaked the wide prospect around in all directions.
There are no more uses of "nebulous" in the book.
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... all of which fell into the nebulous category of we’re-building-up-God’s-house,
James McBride -- The Color of Water
…hunting on Sunday; war on the increasing tendency of young women to paint themselves and smoke in public; war on drinking whiskey—in this connection at least fifty children per summer went to the altar and swore they would not drink, smoke, or curse until they were twenty-one; war on something so nebulous Jean Louise never could figure out what it was, except there was nothing to swear concerning it; and war among the town’s ladies over who could set the best table for the evangelist.