We found one dictionary that defines the word overhappiness:

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1. overhappiness: Wiktionary

Definitions from Wiktionary (overhappiness) ▸ noun:  excessive happiness ▸ Words similar to overhappiness ▸ Usage examples for overhappiness ▸ Idioms related to overhappiness ▸ Wikipedia articles (New!) ▸ Popular adjectives describing overhappiness ▸ Words that often appear near overhappiness ▸ Rhymes of overhappiness ▸ Invented words related to overhappiness