steely  
adjective uk/ˈstiː.li/ us/ˈstiː.li/
  (COLOUR)      
  颜色似钢的,钢灰色的
like steel in colour
  steely grey 钢灰色的 
   (STRONG)      
 坚毅的,坚定的,钢铁般的
very strong and determined
  steely eyes/nerves 坚毅的眼神/大无畏的勇气 
 steely determination 坚定的决心 
 a steely look/stare 冷冰冰的脸色/凝视