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

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ad. In an extraordinary manner.

ad. In an extraordinary manner or degree.

In an extraordinary manner; in an uncommon degree; remarkably; eminently.

Not in the ordinary or common way; in a peculiar manner; specially.

ad. extremely

"But Cameron said it was important to remember that governments faced what he described as an extraordinarily difficult time."

customarily    merrily    militarily    momentarily    necessarily