Wordnet 3.0
ADVERB (1)
1.
in an ominous manner;
- Example: "the sun darkened ominously"
The Collaborative International Dictionary of English v.0.48:
Ominous \Om"i*nous\, a. [L. ominosus, fr. omen. See Omen.]
Of or pertaining to an omen or to omens; being or exhibiting
an omen; significant; portentous; -- formerly used both in a
favorable and unfavorable sense; now chiefly in the latter;
foreboding or foreshowing evil; inauspicious; as, an ominous
dread.
[1913 Webster]
He had a good ominous name to have made a peace.
--Bacon.
[1913 Webster]
In the heathen worship of God, a sacrifice without a
heart was accounted ominous. --South.
[1913 Webster] -- Om"i*nous*ly, adv. -- Om"i*nous*ness,
n.
[1913 Webster]
WordNet (r) 3.0 (2006):
ominously
adv 1: in an ominous manner; "the sun darkened ominously"