Where does “legfájdalmasabb” come from?

legfájdalmasabb (Hungarian) comes from Hungarian fájdalmasabb, from Hungarian fájdalmas, from Hungarian fájdalom, from Hungarian -dalom, from Hungarian -d, from Middle Welsh -nt — 3rd person plural verb ending.

Ancestry of “legfájdalmasabb”, step by step

Step	Language	Word	Meaning
1	Hungarian	fájdalmasabb	—
2	Hungarian	fájdalmas	painful
3	Hungarian	fájdalom	pain
4	Hungarian	-dalom	Added to a verb or a noun to form an abstract...
5	Hungarian	-d	your; Used in the second-person singular definite...
6	Middle Welsh	-nt	3rd person plural verb ending

Every word from Middle Welsh -nt →Every word from Hungarian -d →Every word from Hungarian -dalom →