This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

ad. To an unnerving degree

"On the good nights, or at least, the reassuring nights, everybody knows her, and they gather in unnervingly intent arcs in front of her instruments, forming her words with their own mouths as she sings them, shouting requests in the breaks for songs she hasn't even finished writing yet."