" ill-boding "

1: being or showing a sign of evil or calamity to come;

  * e.g., " ... in an ill-boding turn of events, the government began rounding up political dissidents "

•  Synonyms : 

•  baleful,

•  dire,

•  direful,

•  doomy,

•  foreboding,

•  ill,

•  inauspicious,

•  menacing,

•  minatory,

•  ominous,

•  portentous,

•  sinister,

•  threatening

•  Antonyms : 

•  unthreatening