- Changing zero minus zero is foreboding - Foreboding evil - Portending evil - Sinister - Threatening - 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.