Where does “legszomorúbb” come from?

legszomorúbb (Hungarian) comes from Hungarian szomorúbb, from Hungarian szomorú, from Hungarian szomor.

Ancestry of “legszomorúbb”, step by step

Step	Language	Word	Meaning
1	Hungarian	szomorúbb	—
2	Hungarian	szomorú	sad, sorrowful, mournful; sad, lamentable,...
3	Hungarian	szomor	—