One entry found for serious.

Entry Word: serious
Function: adjective
Text: 1 not joking or playful in mood or manner <our parents were quite serious when they told us not to stay out too late>
Synonyms earnest, grave, humorless, no-nonsense, sedate, severe, sober, solemn, staid, uncomic, unfunny, unsmiling, weighty
Related Words harsh, stern, strict; dignified, distinguished, elevated, serious-minded
Near Antonyms antic, comic, comical, droll, farcical, funny, hilarious, hysterical, laughable, light, light-headed, ludicrous, ridiculous, risible, riotous, screaming, side-splitting, 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, loony (also looney), lunatic, mad, nonsensical, nutty, preposterous, sappy, screwball, senseless, silly, unwise, wacky, weak-minded, witless, zany
Antonyms facetious, flip, flippant, humorous, jesting, jocular, joking, playful
2 having a matter of importance as its topic <a very serious film that dealt with the aftermath of the Gulf War>
Synonyms grave, heavy, weighty
Related Words big, consequential, eventful, important, major, material, meaningful, momentous, significant, substantial
Near Antonyms insignificant, little, minor, slight, small, trivial, unimportant
Antonyms light
3 involving potential loss or injury <a serious accident> -- see DANGEROUS