Specifically, giving indication of a coming ill; being an evil omen
Of or pertaining to an omen or to omens; being or exhibiting an omen; significant.
Dreadful; causing terror, alarm and fear; awesome
Intense; extreme in degree or extent.
Formidable, powerful.
Unpleasant; disagreeable.
Very bad; lousy.
In a terrible way; to a terrible extent; terribly; awfully.