serious Antonyms

frivolous trifling unimportant unorganized small slight silly sentimental seasickness screaming scratcher snickering soporose sportive spumescent swooning teasing temulent thumbing tippling trivial satirical sappy playful piddling picador petty petit parodying offhand nominal negligible prankish preposterous risible riotous ridiculous ribbing raillery quizzical punster punchinello puerile mocking vertiginous less important Mickey Mouse nonmeaningful meaningless mock-heroic