ominous
om.i.nous \'a:m-*-n*s\ aj : being or exhibiting an omen : PORTENTOUS; esp : forebod ing or foreshowing evil : INAUSPICIOUScing, alarming character foreshadowing evil or disaster; PORTENTOUS suggests being frighteningly big or impressive but now seldom definitely connotes forewarning of calamity : FATEFUL suggests being of momentous or decisive importance - om.i.nous.ly av SYN syn PORTENTOUS, FATEFUL: OMINOUS implies having a mena