To be deeply wounded; to have one's feelings hurt. The noun “quick” means the living, as well as the most vital and important part; today it also means the very sensitive flesh between the fingernails and skin.

Why is it called the quick?

The flesh under the nail is called quick because the nail, the hard part, is dead, but the flesh is “alive,” thus the origin of “quick” as the flesh under the nail: the tender, sensitive flesh of the living body, especially that under the nails: nails bitten down to the quick.

What does cut to the quick mean in the Bible?

Meaning: Cause deep emotional hurt, or to cut out the inconsequential in order to get to the facts.