We found one dictionary that defines the word unnerver:

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1. unnerver: Wiktionary

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