"Interiorly" is a word in ENGLISH

To take internal cognizance of; to be conscious of; to have an inward persuasion of.

Inward; interior; being within any limit or surface; inclosed; -- opposed to external; as, the internal parts of a body, …

Inwardly; within the enveloping surface, or the boundary of a thing; within the body; beneath the surface.

Internal; inward; -- opposed to external.

Innermost; inward; internal; deep-seated; hearty.

Inward; internal; intimate.

Inward; internal; hence, true; genuine; real; essential; inherent; not merely apparent or accidental; -- opposed to extrinsic; as, the intrinsic …

In the inner parts; internally.

Internal or true state; essential nature; as, the inwardness of conduct.

In the inner part; inwardly; internally.