Crossword Genius

Lacking mercy, like an incomplete Bible? (8)

Ross

I believe the answer is:

ruthless

'lacking mercy' is the definition.

I don't understand how the rest of the clue works.

(Other definitions for ruthless that I've seen before include "Without mercy or pity" , "Showing no mercy" , "Callous" , "Without pity, merciless" , "Showing no compassion" .)

I've seen this clue in The Times.
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