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

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ad. At once; immediately.

ad. immediately; without delay

ad. Immediately; without delay; directly.

ad. As soon as the thing required may be done by reasonable exertion confined to that object.

At once; without delay; directly.

In law, without delay; as soon as the thing required may be done by reasonable exertion confined to that object: in rules of legal practice, sometimes deemed equivalent to within twenty-four hours.

ad. without delay or hesitation; with no time intervening

"With the exception of places like King County where some poll voting still occurs, the analysis can begin forthwith because in most cases, we won't see any additional counts from those counties for a day or two."

immediately    directly    straightaway   

Blyth    Fifth    Smith    Smyth    fifth    frith    herewith    myth    pith    scythe