felicitousEnglishOxford American Thesaurusfelicitous adjective 1 his nickname was particularly felicitous: apt, well chosen, well expressed, well put, choice, fitting, suitable, appropriate, apposite, pertinent, germane, to the point, relevant, congruous, apropos; informal spot on. ▷antonyms inappropriate. 2 the view is the room's only felicitous feature: fortunate, advantageous, good, favorable, lucky, happy, pleasing, encouraging. ▷antonyms unfortunate.