staid

1 not joking or playful in mood or manner everyone was surprised by the racy joke from the usually staid professor Synonyms earnest, grave, humorless, no-nonsense, po-faced [British], sedate, severe, sober, sobersided, solemn, serious, uncomic, unsmiling, weightyRelated Words harsh, stern, strict; businesslike, professional; dignified, distinguished, elevated, serious-minded; gloomy, grimNear Antonyms antic, comic, comical, droll, farcical, funny, hilarious, hysterical (also hysteric), laughable, light, light-headed, ludicrous, ridiculous, riotous, risible, screaming, sidesplitting, uproarious; featherbrained, flighty, frivolous, goofy, harebrained, lighthearted, puerile, scatterbrained; absurd, asinine, balmy, brainless, cockeyed, crazy, cuckoo, daffy, daft, dotty, fatuous, foolish, half-witted, insane, jerky, kooky (also kookie), loony (also looney), lunatic, mad, nonsensical, nutty, preposterous, sappy, screwball, senseless, silly, unwise, wacky (also whacky), weak-minded, witless, zanyAntonyms facetious, flip, flippant, humorous, jesting, jocular, joking, kittenish, ludic, playful

2 having or showing a formal and serious or reserved manner staid colors that would be good for business attire Synonyms august, distingué, distinguished, imposing, portly, solemn, dignified, statelyRelated Words decorous, proper, seemly; grave, grim, po-faced [British], sober, somber (or sombre); aristocratic, elegant, elevated, handsome, lordly, magisterial, majestic, nobleNear Antonyms coarse, crass, crude, improper, indecent, uncouth, unseemly, vulgarAntonyms flighty, frivolous, giddy, goofy, silly, undignified