47 Because you did not serve the LORD your God joyfully and gladly in the time of prosperity,

Read Deuteronomy 28:47 Using Other Translations

Because thou servedst not the LORD thy God with joyfulness, and with gladness of heart, for the abundance of all things;
Because you did not serve the LORD your God with joyfulness and gladness of heart, because of the abundance of all things,
If you do not serve the LORD your God with joy and enthusiasm for the abundant benefits you have received,