We found one dictionary that defines the word nonverbalness:

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1. nonverbalness: Wiktionary

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