You can't run on this for long (5)

I believe the answer is:

empty

(Other definitions for empty that I've seen before include "'. . . . . vessels make the most sound'" , "worthless" , "Evacuate" , "(Of words) lacking sincerity" , "Containing nothing" .)

I've seen this clue in The New York Times.

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.