Impressive, in dated slang (3)
I believe the answer is:
rad
(Other definitions for rad that I've seen before include "Unit of radiation" , "measure of dangerous activity" .)
I've seen this clue in The Wall Street Journal.
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.