1. By violence.

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

• reiforce,
• perfernce,
• peforme,
• pervoice,
• perforner,
• perfure,
• performes,
• worforce,
• perforced,
• eforce,
• perfomace,
• perfice,
• performe,
• reeforce,
• perfence,
• perfor,
• perfere,
• perfory,
• performece,
• pernouce

• perforated,
• performance,
• perforation,
• performing,
• perform,
• performer,
• perforate.

The adjective form of the word "perforce" is "perforceful".

The plural form of "perforce" is "perforces".

The singular form of the word "perforce" is "force"