IPA: /ɪkˈskruːʧueɪtɪŋli/
KK: /ɪkˈskruːʃieɪtɪŋli/
In a way that is extremely painful or intense.
The pain was excruciatingly sharp, making it hard to focus on anything else.
Excruciatingly → It is formed from "excruciatus" (meaning tortured or torment) and the adverbial suffix "-ly" (meaning in a manner). The word describes something that is done in a manner that causes extreme pain or torment.
Think of the word 'excruciatus' which means tortured, and remember that 'excruciatingly' describes something done in a way that causes intense suffering.