Cleverly deceitful or wily; apt to scheme or trick

• Playfully mischievous in a roguish way

Quietly secretive or stealthy; meant to escape notice

• Furtive in look, action, or manner

Slyly; in a secret or sneaky manner

• Secretly or without permission, as on the sly

Subtly suggestive or indirect; understated

• Light or delicate in degree; slight