1. successful A man is successful in any case if he achieves or gains what he seeks; he is known as a successful man if he has achieved or gained worthy objects of endeavor; he is fortunate or lucky if adv Synonyms: fortunate, favored, lucky, prospered, prosperous, successful, happy Antonyms: broken, fallen, miserable, unhappy, woful, crushed, ill-starred, unfortunate, unlucky, wretched