Crossword Genius

Hard-hearted (8)

Ross

I think it could be either:

obdurate

ruthless

'hard-hearted' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for ruthless that I've seen before include "Unmerciful" , "Without mercy or pity" , "Unsparing" , "Without pity or compassion" , "Hard-hearted" .)

I've seen this clue in The Sun and the Evening Standard.
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