What is another word for hard shell?
Pronunciation: [hˈɑːd ʃˈɛl] (IPA) 
"Hard shell" is a common phrase used to describe something that is tough, durable, and difficult to penetrate. However, there are many synonyms that can be used in place of this phrase, depending on the context and the object being described. Some of the most common alternatives include "tough exterior," "sturdy casing," "resilient covering," "rigid sheath," "durable armor," "robust housing," and "solid barrier." Each of these alternatives conveys a slightly different aspect of the concept of a hard shell, but they all communicate the idea of a strong and impenetrable surface that provides protection and security.
