sinister

Adjective

• on or starting from the wearer's left
  • bar sinister
    

• stemming from evil characteristics or forces; wicked or dishonorable
  • black deeds
    
  • a black lie
    
  • his black heart has concocted yet another black deed
    
  • Darth Vader of the dark side
    
  • a dark purpose
    
  • dark undercurrents of ethnic hostility
    
  • the scheme of some sinister intelligence bent on punishing him-Thomas Hardy
    

• threatening or foreshadowing evil or tragic developments
  • a baleful look
    
  • forbidding thunderclouds
    
  • his tone became menacing
    
  • ominous rumblings of discontent
    
  • sinister storm clouds
    
  • a sinister smile
    
  • his threatening behavior
    
  • ugly black clouds
    
  • the situation became ugly
    

Related words

• Synonyms: 
  black , dark , baleful , forbidding , menacing , minacious , minatory , ominous , threatening