Grave, Threatening "something that is perceived to have a bad outcome", "does not
bode well"
A feeling we're
struck by when perceiving a threat, mostly through what we see or hear.
"The employee made a grave mistake, and his boss looks at him
Ominously".
"The ship sailed into treacherous waters, now
ominously surrounded by rocks under
shallow water"
"The survivor of the crash, finds him self in an ominously looking landscape".
"As Indiana Jones walks into the pitch black cave, he is met with an Ominously loud shriek
echoing from further in".