Added 10 October 2026 gleefulness noun Categories: FeelingsObscure Words noun ! Definition from WordNet 3.1, Princeton University. More about gleefulness at Wordnik → Where our words come from → Great merriment. Related Words: gleemirthfulnessmirthhilarityjoyousnessgladnessjoyfulnesscheerfulnessgleesomenessgaietydelightedness Back to today's word