1. In a manner to terrify or astonish.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• tramendiously,
• tremendoulsy,
• tremendousily,
• tremandously,
• tremendousely,
• trimendously,
• tremoundously,
• tremendusly,
• tremindously,
• tramendusly,
• tremendouly,
• trenmendously,
• trementiously,
• tremenduosly,
• trumendously,
• tremendeously,
• tremendoushly,
• tremediously,
• temendously,
• trememndously

• tremendous.

The adjective form of the word "tremendously" is "tremendous".

The plural form of the word "tremendously" remains the same; it does not change.

The singular form of the word "tremendously" is "tremendous"