Where does “legbelsőbb” come from?

legbelsőbb (Hungarian) comes from Hungarian belsőbb, from Hungarian belső, from Hungarian bel- — interior, internal, domestic.

Ancestry of “legbelsőbb”, step by step

StepLanguageWordMeaning
1Hungarianbelsőbb—
2Hungarianbelsőinterior, internal, inner, inside, end-/endo-;...
3Hungarianbel-interior, internal, domestic
Every word from Hungarian bel- →Every word from Hungarian belső →Every word from Hungarian belsőbb →