1. In a sudden manner.

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

• sadenly,
• sudenly,
• suddently,
• suuddenly,
• suddendly,
• sudennly,
• suddnley,
• suddunly,
• suddenely,
• suddenlt,
• suddent,
• suddnely,
• suddendy,
• sudeenly,
• ssuddenly,
• suddena,
• sudnely,
• suddens,
• surtenly,
• suddel

• Sandily,
• Sundialy,
• soundly,
• sudden,
• soddenly,
• sundial,
• Sindhully.

The adjective form of "suddenly" is "sudden".

The plural form of the word "suddenly" is "suddenlies." However, it is not commonly used as a plural noun. Instead, "suddenly" is usually used as an adverb and does not have a commonly used plural form.

The singular form of the word "suddenly" is "sudden"