And whereas the wants of the Californians were nebulous and undefined, the wants of the Okies were beside the roads, lying there to be seen and coveted: the good fields with water to be dug for, the good green fields, earth to crumble experimentally in the hand, grass to smell, oaten stalks to chew until the sharp sweetness was in the throat.
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.