dangerous

adjective3

1. •
   full of risk, so that someone could easily be hurt or killed

   • Railway crossings without gates are highly dangerous.
2. •
   Causing danger; ready to do harm or injury.

   • If they incline to think you dangerous, / They have their knavish Arts to make you so. — 1696
3. •
   (informal, old-fashioned) In a condition of danger, as from illness; threatened with death.