"Sting to the quick" is a phrase that refers to something that deeply hurts or offends a person's emotions. There are several synonyms that can be used to describe this feeling. These include "cutting to the core," "striking to the heart," "wounding deeply," and "hitting a nerve." Other synonyms for this phrase include "hitting below the belt," "stinging to the soul," and "slashing to the bone." All of these terms capture the intense emotional pain that can arise from an insult, betrayal, or other hurtful experience. Using these synonyms can help to clarify the intensity of the hurt and its impact on one's emotional state.