Webster's Revised Unabridged Dictionary · 1913

Forthwith

Forthwith (? o?; see With) , adverb

1.
Immediately; without delay; directly.
Immediately there fell from his eyes as it had been scales; and he received sight forthwith. — Acts ix. 18
2.
(Law) As soon as the thing required may be done by reasonable exertion confined to that object. — Bouvier