Crossword Genius

A form of address to a fellow lacks hint of thoughtfulness — one is offensive (6)

Ross

I believe the answer is:

abuser

'one is offensive' is the definition.
(a abusive or offensive person)

I can't explain the rest of the clue.

(Other definitions for abuser that I've seen before include "One who reviles or a misuser of drugs" , "one who uses bad language" , "Bully" , "Person who over-indulges in, say, drugs or drink" , "One mistreating another" .)

I've seen this clue in The 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.