adjective
Synonyms: serious 1, earnest, grave, no-nonsense, sober, sobersided, solemn, somber, staid, weighty
Related Word: calm, placid, serene, tranquil; collected, composed, dispassionate, imperturbable, unruffled; decorous, dignified, proper, seemly
Contrasted words: indecorous, undignified, unseemly; airy, flippant, light
Antonyms: flighty