Webster's English Dictionary

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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