1. Apt to forget; neglectful; inattentive; causing to forget.

2. Forgetfully.

3. not retentive

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

• forgetfull,
• forgettful,
• forfetful,
• forgeful,
• forgetgul,
• forgtetful,
• gorgetful,
• dorgetful,
• corgetful,
• vorgetful,
• torgetful,
• rorgetful,
• firgetful,
• fkrgetful,
• fogetful,
• tormenful,
• forgetabl,
• Conetful,
• forgetfall,
• forgetfool

• forget,
• forgetfully,
• forseti,
• Forrest,
• forgettable,
• forged,
• frightful,
• Forrester,
• forgette.

The adjective form of the word "forgetful" is "forgetful".

The plural form of the word "forgetful" is "forgetfuls." However, it is more commonly used as an adjective, so the plural form is not commonly used.

The singular form of the word "forgetful" is "forgetful" as it is already in its singular form.