Where does “legjárhatóbb” come from?

legjárhatóbb (Hungarian) comes from Hungarian járhatóbb, from Hungarian járható, from Hungarian -ható, from Hungarian -hat, from Hungarian hát, from Proto-Uralic kutte — ridge; six.

Ancestry of “legjárhatóbb”, step by step

Step	Language	Word	Meaning
1	Hungarian	járhatóbb	—
2	Hungarian	járható	passable; practicable, workable
3	Hungarian	-ható	-able, -ible. Added to a verb to form an...
4	Hungarian	-hat	can, could, may, might, be allowed to. Added to...
5	Hungarian	hát	back; well; then, and, but
6	Proto-Uralic	kutte	ridge; six

Every word from Proto-Uralic kutte →Every word from Hungarian hát →Every word from Hungarian -hat →