the GNU version of the Collaborative International Dictionary of English
n. The quality or state of being staid; seriousness; steadiness; sedateness; regularity; -- the opposite of wildness, or levity.
The Century Dictionary and Cyclopedia
n. The state or character of being staid; sobriety; gravity; sedateness; steadiness: as, staidness and sobriety of age.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a trait of dignified seriousness
Word Usage
"There is a whole category of ersatz adults who've mistaken the apparent staidness of the grownups (who they observe from the outside) for the qualifying characteristic of adulthood and tried to skip the scary merry-go-round."