Adjective
The word is derived from glad
I will be the gladdest thing under the sun! I will touch a hundred flowers and not pick one. Edna St. Vincent Millay
Of the gladdest moments in human life, methinks, is the departure upon a distant journey into unknown lands. Shaking off with one mighty effort the fetters of Habit, the leaden weight of Routine, the cloak of many Cares and the slavery of Civilization, man feels once more happy. Richard Francis Burton