1. In a manner to be dreaded.

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

• deadfull,
• dreadfuly,
• greatfully,
• dreafully,
• dreadfull,
• dreadfule,
• dredfully,
• dredfull,
• dreadfall,
• drefully,
• sreadfully,
• xreadfully,
• creadfully,
• dreadfullly,
• dreanfully,
• dreamfuly,
• dreadfulls,
• Frawdfully,
• Wreakfullly,
• dreampully

• dreadfulness,
• dreadful,
• dried-up,
• dried fruit.

The adjective form of the word "dreadfully" is "dreadful".

The plural form of the word "dreadfully" is "dreadfullys".

The singular form of the word "dreadfully" is "dreadful"