The Swedish term "rejäl, allvarlig, seriös" matches the English term "serious"

other swedish words that include "rejäl" : english :
hederlig, renhårig, ärlig, rejäl, rättskaffens honest
säker, visst, rejäl, viss sure
other swedish words that include "allvarlig" : english :
sträng, allvarlig austere
allvar, allvarlig earnest
viktig, grav, allvarlig grave
allvarligt seriously