prosperous UK /ˈpɹɒs.p(ə.)ɹəs/US /ˈpɹɑs.pə.ɹəs/ adjective3 •Characterized by success.Trading Babe Ruth was far more prosperous for the Yankees than for the Red Sox. •Well off; affluent.He was raised in a very prosperous household. •Favorable.He chose a prosperous lottery number that evening. formsmore prosperous · most prosperous