ear-achingly
adv1
In such a way to cause earache.
- Next she began making humming noises in an ear-achingly high-pitched tone. It was like someone running their fingers along the rim of a glass.2017, David Walliams [pseudonym; David Edward Williams], “The Smell of Old Books”, in Bad Dad, London: HarperCollins Children’s Books, →ISBN, page 41: