(a.) Even-tempered; calm; tranquil; serene; not passionate or giddy; composed\; staid; as, a sedate soul, mind, or temper.

anesthetize aristocratic august calm collected composed controlled conventional cool courtly decorous demure detached dignified dispassionate dope drug earnest entrance even-tempered formal frowning fussy grand grave grim grim-faced grim-visaged hypnotize imperturbable imposing kingly long-faced lordly lull to sleep magisterial magnetize majestic mesmerize moderate narcotize no-nonsense noble old-fashioned peaceful placid prim princely proper prudish put to sleep put under queenly refined regal rock to sleep royal seemly serene serious sober sober-minded sobersided solemn somber staid stately statuesque stiff stone-faced straight-faced strait-laced temperate thoughtful trance tranquil undisturbed unflappable unperturbed unruffled unsmiling venerable weighty worthy