airy-fairy

adjective

ˈer-ē-ˈfer-ē 

1

chiefly British : delicate, fairylike

2

chiefly British : lacking substance or purpose : not practical

in … an airy-fairy, unserious, insufficiently careful fashion

—The Times Literary Supplement (London)

Word History

First Known Use

1837, in the meaning defined at sense 1