STRONG

(DIFFICULT TO BREAK) [adjective] -er, -est - difficult to break, destroy or make illThe window is made from very strong glass - it won't shatter.Is the container strong enough to survive an impact with a train?He's never been very strong, and I'm afraid all the excitement was too much for him.I've never seen anyone with such a strong will to live - he simply refused to die.See also strength (EFFORT).You need strong nerves/a strong stomach (= the ability to not be upset by unpleasant things) to work in the accident department.A strong-box is a specially made lockable box which is very difficult to break. Valuable items are put in it to keep them safe.