1. In a petty manner.

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

• lettile,
• pettty,
• pettal,
• prettly,
• pently,
• pettite,
• pettals,
• partily,
• fertily,
• prettilly,
• pentaly,
• kettly,
• puttly,
• dottilly,
• pettio,
• prettily,
• perttily,
• petitly,
• pettilyy,
• pettisly

• Petell,
• petal,
• petillo.

The adjective form of the word "pettily" is "petty".