minacious

adj

1. threatening or foreshadowing evil or tragic developments
   1. a baleful look
   2. forbidding thunderclouds
   3. his tone became menacing
   4. ominous rumblings of discontent
   5. sinister storm clouds
   6. a sinister smile
   7. his threatening behavior
   8. ugly black clouds
   9. the situation became ugly

   Synonym:    balefulforbiddingmenacingminatoryominoussinisterthreatening