When it comes to talking about a strong barrier, there are various alternatives available that can be considered. Some synonyms for the word "strong barrier" are "impenetrable wall," "unyielding barricade," "formidable obstruction," and "resilient fortification." One can also use "sturdy fence," "solid shield," and "mighty rampart" to convey the concept of a strong barrier. Other options include "indestructible bulwark," "impregnable defense," and "unassailable barrier," each evoking a sense of impenetrability and strength. Ultimately, selecting the right synonym for the word "strong barrier" depends on the context it is being used in, and the impression one wants to create.