Crossword Genius

Unpleasantly serious or unfriendly (5)

Ross

I believe the answer is:

stern

(Other definitions for stern that I've seen before include "Unrelenting at the back of the boat?" , "at the back of the galley!" , "Poop" , "Grave; rear" , "Harsh at the back of the ship" .)

I've seen this clue in The Irish Times.
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