IPA: /ˈdraɪli/
KK: /draɪli/
In a way that is not emotional or enthusiastic; often used to describe a way of speaking that is serious or matter-of-fact.
He explained the rules of the game dryly, without any excitement.
Dryly → It is formed from "dry" (from Old English *drȳge*, meaning free from moisture) and "-ly" (a suffix meaning in a manner of). The word "dryly" means in a manner that is free from moisture, often used to describe a lack of emotion or enthusiasm in speech or writing.
Think of being 'free from moisture' ('dry') and how that can describe a way of speaking that lacks emotion or excitement.