The tree's bulk loomed ominously, a black bar high above her head.

The street was dark, empty, the old buildings in this ancient part of the city looming above them ominously.

The black stack loomed ominously behind him as exhaust poured out of it.

She crouched low in her seat, no longer wanting to watch as the city loomed toward them ominously.

Then with school looming ominously on the next day's horizon there was a stampede home to see who could be first in bed.

Now, as the school year ends, the summer looms ominously.

The shadows loomed ominously; it was all she could do to look at them.

The possibility of more postponements loomed ominously on all fronts.

Behind her, the shape of a man loomed ominously.

Its black muzzle loomed ominously from the curtains, but that was all.