Airily is an adverb. It means in a light-hearted way.
I’m a notorious worrier. I take everything very seriously.
In most cases, I take things way too seriously. In other cases, i.e. instances when things should be taken extremely seriously, I take things appropriately seriously.
I like to kid around a lot, but it’s a facade. Underneath, I’m the most somber guy I know.
The point is, I’m the last person you should look to for a comment on the word airily. Move along. Move along. There’s nothing to see here.