Where does “legtrehányabb” come from?

legtrehányabb (Hungarian) comes from Hungarian trehányabb, from Hungarian trehány, from Slovak trhan, from Czech -an, from Old Czech -ěnín, from Proto-Slavic -janinъ, from Proto-Slavic -inъ, from Proto-Indo-European -iHnos — adjectival suffix.

Ancestry of “legtrehányabb”, step by step

StepLanguageWordMeaning
1Hungariantrehányabb
2Hungariantrehányslovenly, sloppy
3Slovaktrhantatterdemalion, tramp
4Czech-anForms nouns, including inhabitant names
5Old Czech-ěnínforms nouns, including inhabitant names
6Proto-Slavic-janinъCreates male dweller terms from toponyms or place...
7Proto-Slavic-inъ-ine; Creates singulatives, mostly with...
8Proto-Indo-European-iHnosCreates adjectives of materials
9Proto-Indo-European-no-adjectival suffix
Every word from Proto-Indo-European -no-Every word from Czech -anEvery word from Proto-Slavic -janinъ