heart of oak

A trait said to belong to a very emotionally and/or mentally strong person. I don't know how a soldier does it—he or she must have a heart of oak. My brother has a heart of oak and has remained totally calm while coping with his wife's sudden illness.

Common Names:

Name	Pronounced	Usage
Marisela	-	Spanish
Aleksandre	-	Georgian
Varius	-	Ancient Roman
Young-Ho	yung-ho	Korean
Encarnita	en-kahr-NEE-tah	Spanish
Bhavana	-	Indian, Hindi, Marathi, Kannada, Malayalam