Crossword clues for Don't be so serious! 9 letters:SERIOUSLYYou're kiddingOHBROTHERNo, you can't be serious!NARCOTICSSerious social problemREENACTOROne seriously into Civil War history, maybeMORTALSINSerious offense against GodUPTHEANTEGet serious, gambler-styleFACETIOUSNot meant to be taken seriouslyDEEPWATERSerious difficulty.DRAMEDIESSeriously funny shows?SICKWEAVEFabric that needs serious mending?TAKEATOLLResult in serious damageOHCOMENOWLet's be serious here ...EARNESTLYSeriously.MARIOCARPSerious complaint from author Puzo?SEAKITTENWhat PETA wants to rename the fish, in hopes that people will stop catching and eating fish (seriously)SOLEMNITYSeriousnessTURNSITONGets seriousEXTENUATERender less serious by giving excuses.OHBROTHER*"Seriously!?"ACUTECAREClinic service for serious injuriesNOSEDIVESSerious downturnsNOKIDDINGAre you serious?JACKKNIFESerious accidentBOOKWORMSVery serious studentsARCHRIVALSerious competitorUNRIVALEDLacking serious challengeNEARFATALVery serious, as an accidentENDEAVORSSerious effortsDONTLAUGHNo, seriously!ATALOWEBBDeclining seriouslyDEEPWATERSerious trouble, so to speakCOMEONMANDude... seriously?!IMEANCMONSeriously now...SINKSONESWith 48-Across, starts serious work onINAMORATASerious girlfriendBOMBSHELLSerious surpriseINEARNESTSeriouslyREDALERTSWarnings of serious danger (NL Central)HEAVYDATESerious social engagementSMILELESSSerious; dourITSNOJOKEI'm seriousRUSTEATENSeriously weathered, as old carsHEAVYDATESerious romantic outingHUMANRACESeriously endangered group in Mary Shelley's "The Last Man"MORTALSINSerious transgression, in CatholicismKIDAROUNDNot be seriousREDALERTSSerious warningsNEARFATALLike some serious accidentsBELIEVEITSeriously!PIZZAFACEOne with serious acne, pejoratively