menacing menacing /ˈmɛnəsɪŋ/

adjective

1. () Threatening or foreshadowing evil or tragic developments  ( baleful , forbidding , minacious , menacing , minatory , ominous , sinister , threatening )
   threatening or foreshadowing evil or tragic developments
    A baleful look
   a baleful look
    Forbidding thunderclouds
   forbidding thunderclouds
    His tone became menacing
   his tone became menacing
    Ominous rumblings of discontent
   ominous rumblings of discontent
    Sinister storm clouds
   sinister storm clouds
    A sinister smile
   a sinister smile
    His threatening behavior
   his threatening behavior
    Ugly black clouds
   ugly black clouds
    The situation became ugly
   the situation became ugly