serious Synonyms - page 2

overserious po-faced unsmiling sobersided unaffecting unhumorous unplayful unsarcastic heavy-duty life-threatening life-or-death toilful tough troubling urgent vital worrisome worrying worse seriousness serialize all important backbreaking severely heavyweight big league life-and-death world-shaking perilous acute constitutive contemplative critical crucial decisive deep demure desperate difficile difficult dignified dire disturbing dour drastic epochal consignificant considerate ambitious appreciable