'Sedateness' definitions:

Definition of 'sedateness'

noun

A trait of dignified seriousness [syn: sedateness, staidness, solemnity, solemness]

From: GCIDE

Sedate \Se*date"\, a. [L. sedatus, p. p. of sedare, sedatum, to allay, calm, causative of sedere to sit. See Sit.] Undisturbed by passion or caprice; calm; tranquil; serene; not passionate or giddy; composed; staid; as, a sedate soul, mind, or temper. [1913 Webster]
Disputation carries away the mind from that calm and sedate temper which is so necessary to contemplate truth. --I. Watts. [1913 Webster]
Whatsoever we feel and know Too sedate for outward show. --Wordsworth. [1913 Webster]
Syn: Settled; composed; calm; quiet; tranquil; still; serene; unruffled; undisturbed; contemplative; sober; serious. [1913 Webster] -- {Se*date"ly}, adv. -- {Se*date"ness}, n. [1913 Webster]