This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Full of jubilant delight; joyful.

adj. Exuberantly or triumphantly joyful.

adj. Merry; gay; joyous.

Actively merry; gay; joyous.

adj. full of high-spirited delight

"We were all around his age — pre-pubescent, and reedy-voiced and when we sang along to the song — no knock on Jermaine, Jackie and the rest — but it was Michael's parts we sang in gleeful, screechy unison."

joyous   

gleefully    glee   

merry    gay    joyous    pleased    overjoyed    exhilarated    high-spirited    elated   

exultant    impish    mirthful    fiendish    derisive    feral    joyful    maniacal    anguished    frenzied