Where does “leghalálosabb” come from?

leghalálosabb (Hungarian) comes from Hungarian halálosabb, from Hungarian halálos, from Hungarian halál, from Hungarian -ál, from Hungarian -l, from Proto-Uralic -l.

Ancestry of “leghalálosabb”, step by step

Step	Language	Word	Meaning
1	Hungarian	halálosabb	—
2	Hungarian	halálos	fatal, deadly, lethal
3	Hungarian	halál	death
4	Hungarian	-ál	Same as -l with the "-á-" linking vowel. Used for...
5	Hungarian	-l	Appended to a noun, an adjective or less...
6	Proto-Uralic	-l	—

Every word from Proto-Uralic -l →Every word from Hungarian -ál →Every word from Hungarian -l →