This is the 2904th most frequent Russian word.
внутренней
"Внутренней" means "inner" or "internal" in English.
The word 'внутренней' describes the location of the room relative to other spaces, indicating that the room is inside.
Эта дверь ведет к внутренней комнате.
This door leads to the inner room.
The word 'внутренней' is applied to describe the nature of 'strength,' referring to a metaphorical concept internal to an individual.
Я работаю над укреплением внутренней силы.
I am working on strengthening internal strength.
The word 'внутренней' qualifies 'policy,' specifying that the policy pertains to internal matters of an organization or state rather than external ones.