gailyEnglishOxford Dictionary of Englishgaily /ˈɡeɪli / ▸ adverb 1 in a cheerful or light-hearted way: he waved gaily to the crowd. ▪ without thinking of the consequences: she plunged gaily into speculation on the stock market. 2 [as submodifier] with a bright or attractive appearance: gaily coloured sailing boats.