Hyphens, En Dashes, Em Dashes

Q. I understand 5.91 to mean that adjectives modified by adverbs ending in -ly are always open. But what about instances such as “provide developmentally appropriate information”? My instinct is not to hyphenate, but I don’t think developmentally is an adverb here, so I’m not sure if the always-open rule applies.

A. Developmentally is indeed an adverb modifying the adjective appropriate. It’s exactly the kind of situation we’re referring to in 5.91. Chicago style is not to hyphenate.