Crossword Genius

Forbidding (like the reaper?) (4)

Ross

I believe the answer is:

grim

(Other definitions for grim that I've seen before include "Stern and unsmiling" , "Resolute" , "Serious, forbidding" , "Very serious/gloomy" , "Serious; dour" .)

I've seen this clue in The Guardian.
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