1. advantageous, successful, prosperous. Fortunate, happy, lucky refer to persons who enjoy, or events that produce, good fortune. Fortunate implies that the success is obtained by the operation of favorable circumstances more than by direct effort; it is usually applied to grave or large matters (especially those happening in the ordinary course of things): fortunate in one's choice of a wife; a fortunate investment. Happy emphasizes a pleasant ending or something that happens at just the right moment: By a happy accident I received the package on time. Lucky, a more colloquial word, is applied to situations that turn out well by chance: lucky at cards; my lucky day.