When you do something gleefully, you do it in an extremely happy way. If two kids call to each other gleefully across the playground, there's laughter and delight in their voices.

Wedding guests might rush gleefully onto the dance floor when the DJ plays a popular song, and a child who is trick or treating for the first time will often gleefully dress in her ghost costume and even more gleefully watch her plastic pumpkin fill with Halloween candy. The adjective gleeful and related noun glee are at the root of gleefully, all of them sharing the Latin root word gliu, "entertainment, mirth, jest, or play."

Definitions of gleefully
  1. adverb
    in a joyous and gleeful manner
    “the old man had greeted her gleefully
    synonyms: joyfully, joyously
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    in a joyless manner; without joy
Word Family