adjective
Synonyms: serious 1, earnest, grave, no-nonsense, sedate, sober, sobersided, solemn, somber, weighty
Related Word: decorous, formal; collected, composed, cool; priggish, smug; starchy, stuffy
Contrasted words: breezy, devil-may-care, easy, frivolous; debonair, jaunty; playful, sportive; hoydenish, rakish; fresh, irreverent; uncontrolled, unrestrained
Antonyms: unstaid