We found one dictionary that defines the word kiddiness:

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1. kiddiness: Wiktionary

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