Engels [noun]Frans [noun] ▶serious [noun] ▶sérieux [noun] Engels [adj] Frans [adj] ▶serious [adj] The accident was serious. ▶grave [adj] L’accident était grave. ▶serious [adj] He asked me in a serious tone.Is your offer serious? ▶sérieux [adj] Il m’a demandé d’un ton sérieux.Votre offre est-elle sérieuse ?