1. Infallibly.

2. Infallibleness, specially in regard to faith and morals, as claimed by Roman Catholic theologians on behalf of the Church as a whole, and the Pope, speaking ex cathedra, as the head of it.

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

• infallabilty,
• infalability,
• infallibilty,
• infallability,
• infalibility,
• infaliability,
• infalliblity,
• unfallibility,
• jnfallibility,
• knfallibility,
• onfallibility,
• 9nfallibility,
• 8nfallibility,
• ibfallibility,
• imfallibility,
• ijfallibility,
• infallibilis,
• inffalibility,
• infallablity,
• Unpaltibility

• inapplicability,
• inflexibility,
• invalidity,
• infallible.

The adjective form of "infallibility" is "infallible".

The plural of the "infallibility" can be the "infallibilities".

The singular of the "infallibility" can be the "infallibility".