1. That cannot be broken: not to be violated.

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

• unfrangible,
• jnfrangible,
• knfrangible,
• onfrangible,
• 9nfrangible,
• 8nfrangible,
• ibfrangible,
• imfrangible,
• ijfrangible,
• ihfrangible,
• indrangible,
• incrangible,
• invrangible,
• ingrangible,
• intrangible,
• inrrangible,
• inferangible,
• infrangable,
• Infringable,
• Infrangle

• infrahuman,
• infrasonic,
• infra dig.

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

The plural form of the word "infrangible" is "infrangibles".

The singular form of the word "infrangible" is "infrangible". It is an adjective, and its form does not change when referring to a singular noun.