ominous
Concise Oxford English Dictionary © 2008 Oxford University Press:
ominous/ˈɒmɪnəs/
▶adjective giving the worrying impression that something bad is going to happen.
– derivatives
ominously adverb,
ominousness noun.
ominously adverb,
ominousness noun.
– origin C16: from L. ominosus, from omen, omin- ‘omen’.
'ominous' also found in these Oxford entries:

