glee·ful \ˈglēfəl\adjective : full of glee : exuberantly or exultantly joyful : delightedly or triumphantly happy : glad, mirthful, merry < a gleeful romp in the countryside > < gleeful over the downfall of their enemies > • glee·ful·ly\-fəlē, -li\adverb • glee·ful·nessnoun-es