What is the homonym for unbending isthmus?

This is a bit of a tricky one! There isn't a perfect homonym for "unbending isthmus" because it's a phrase with a specific meaning. However, we can play with the words and find some options:

* "Unbending" could be replaced with "unbending", which is a homonym but doesn't really change the meaning.

* "Isthmus" has no true homonyms. It is a unique word.

Therefore, the closest we can get to a homonym is to use the word "unbending" to replace the word "unbending". This highlights the rigidity and inflexible nature of an isthmus, which is a narrow strip of land connecting two larger landmasses.

Let me know if you'd like to explore other wordplay options!