Definition of "tremendously"

[…] until the Wicked Witch dies you will not see your Uncle and Aunt again. Remember that the Witch is Wicked—tremendously Wicked—and ought to be killed.

1900 May 17, L[yman] Frank Baum, “The Wonderful Emerald City of OZ”, in The Wonderful Wizard of Oz, Chicago, Ill., New York, N.Y.: Geo[rge] M. Hill Co., page 129