In the following question, out of the given four alternatives, select the alternative which best expresses the meaning of the Idiom/Phrase. As hard as nails

Physically or mentally tough

The idiom "as hard as nails" means to be physically or mentally tough. It is used to describe someone who is not easily defeated or discouraged.

The other options are not correct.

• Stubborn: This means to be unwilling to change your mind or to give in.
• To feel no pain: This means to be insensitive to pain.
• Hard working: This means to work hard and diligently.

Therefore, the best alternative is Physically or mentally tough.