Uninviting (4)
I believe the answer is:
grim
'uninviting' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for grim that I've seen before include "Forbidding harsh and unpleasant" , "Stern and unsmiling" , "Very serious, gloomy" , "Dark, depressing" , "looking black" .)