1. In a sly manner; with artful secrecy.

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

• silkly,
• slley,
• sallly,
• slill,
• styley,
• slyle,
• syyle,
• sillly,
• slelf,
• slolly,
• sloly,
• slole,
• slwoly,
• sloley,
• styly,
• smoly,
• slolwy,
• sololy,
• slly,
• slalry

• slowly.

The adjective form of the word "slyly" is "sly".

The plural form of the word "slyly" is "slylies". However, it is important to note that the word is not commonly used in the plural form.

The singular form of the word "slyly" is "slyly" itself. The word does not change when it is used in singular or plural form.