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• n  a trait of dignified seriousness

• His staidness ignored cries from coaches and spectators to outlaw out-of-bounds kickoffs and drop restrictions on quick passes.
• Both before and after the outcome had been determined, the exuberant, boisterous Republicans turned topsy-turvy their reputation for staidness.
• For those used to staidness from string quartets, the atmosphere had something of the wild freedom of coasting downhill on a bike, no hands.

• sedateness
• solemnity
• solemness