Where does “leghűvösebb” come from?

leghűvösebb (Hungarian) comes from Hungarian hűvösebb, from Hungarian -ebb, from Hungarian -é-, from Hungarian -d, from Middle Welsh -nt — 3rd person plural verb ending.

Ancestry of “leghűvösebb”, step by step

Step	Language	Word	Meaning
1	Hungarian	hűvösebb	—
2	Hungarian	-ebb	-er, more
3	Hungarian	-é-	—
4	Hungarian	-d	your; Used in the second-person singular definite...
5	Middle Welsh	-nt	3rd person plural verb ending

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