We found one dictionary that defines the word overjoyfulness:

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1. overjoyfulness: Wiktionary

Definitions from Wiktionary (overjoyfulness) ▸ noun:  The state of being overjoyful ▸ Words similar to overjoyfulness ▸ Usage examples for overjoyfulness ▸ Idioms related to overjoyfulness ▸ Wikipedia articles (New!) ▸ Popular adjectives describing overjoyfulness ▸ Words that often appear near overjoyfulness ▸ Rhymes of overjoyfulness ▸ Invented words related to overjoyfulness