Like many ASL users (4)

I believe the answer is:

deaf

(Other definitions for deaf that I've seen before include "like stone?" , "Unable to pick up" , "Unable to hear" , "Deprived of the sense of hearing" , "Not prepared to listen" .)

I've seen this clue in the Universal.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.