Wiktionary
earsplittingly
adv. In an earsplitting way; very loudly.
Usage examples of "earsplittingly".
Seconds later an eerie, earsplittingly loud chirping sound rang through the ship--an alarm, Kim was sure.
The night before, the marble chessboard in Hobbes's locker had suddenly, earsplittingly cracked, rudely interrupting her fitful sleep.