prosperous (adj.)

early 15c., "favorable, auspicious, tending to bring success;" late 15c., "flourishing, successful, making good progress in anything good or desirable;" from Anglo-French prosperous, prospereus, Anglo-Latin prosperosus, or directly from Old French prospereus (15c.), from prosperer, extended form of prospere, from Latin prosperus "favorable, fortunate" (see prosper). Related: Prosperously; prosperousness.