All 7 Uses

ominous
in
Harry Potter (#6) and the Half-Blood Prince
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An immense chimney, relic of a disused mill, reared up, shadowy and ominous.†
Chpt 2

ominous = threatening (suggestive of, or foreshadowing bad things to come)
He had stopped coming to meals at the staff table, an ominous sign, and on the few occasions when they had passed him in the corridors or out in the grounds, he had mysteriously failed to notice them or hear their greetings.†
Chpt 11
I'm starving," said Harry, once the door had closed behind them and they were hurrying through the dark and deserted grounds; he had abandoned the rock cake after an ominous cracking noise from one of his back teeth.†
Chpt 11
His powers, as you heard, were surprisingly well-developed for such a young wizard and -- most interestingly and ominously of all -- he had already discovered that he had some measure of control over them
Chpt 13 *

ominously = foreshadowing evil
Before anybody could respond to this ominous pronouncement, tindormitory doors opened again and Mr. and Mrs. Weasley hurried up the ward.†
Chpt 19

ominous = threatening (suggestive of, or foreshadowing bad things to come)
The careless way in which Voldemort regarded this Horcrux seemed most ominous to me.†
Chpt 23
Ominously, there were many cob-webbed boxes piled on a table where Harry was clearly supposed to sit; they had an aura of tedious, hard, and pointless work about them.†
Chpt 24

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