We found one dictionary that defines the word idioticness:

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1. idioticness: Wiktionary

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