I am trying to use untenably in a sentence. Not to showcase my ignorance, but I feel like the modern usage is out of whack with the grammar rules. The sentence in question is:
- Marin was getting untenably expensive.
Here untenably is an adverb, but modifies expensive. So, it should properly be untenable expensive instead.
- Marin was getting untenable expensive.
But that sounds archaic to my ear.
Also, I am having a tough time coming up with the correct usage of untenably as an adverb. Something seems wrong with these but I don't know what:
- She untenably ran...
- She untenably worked...
Can someone enlighten me here? Why does sentence 2 sound wrong? Why don't sentences 3 and 4 sound right?