Unkind and spiteful (9)

I believe the answer is:

obnoxious

(Other definitions for obnoxious that I've seen before include "Seriously disliked" , "Repugnant" , "Nasty" , "Thoroughly offensive and objectionable" , "Extremely unpleasant" .)

I've seen this clue in The Guardian.

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.