Where does “legszintetikusabb” come from?

legszintetikusabb (Hungarian) comes from Hungarian szintetikusabb, from Hungarian szintetikus, from English synthetic, from French synthétique, from Ancient Greek συνθετικός, from Ancient Greek σύνθεσις, from Ancient Greek συντίθημι, from Ancient Greek σῠν- — beside, with.

Ancestry of “legszintetikusabb”, step by step

Step	Language	Word	Meaning
1	Hungarian	szintetikusabb	—
2	Hungarian	szintetikus	synthetic
3	English	synthetic	Of, or relating to synthesis; Produced by...
4	French	synthétique	synthetic
5	Ancient Greek	συνθετικός	skilled in putting together, constructive;...
6	Ancient Greek	σύνθεσις	a putting together, composition, combination,...
7	Ancient Greek	συντίθημι	to assemble, put together
8	Ancient Greek	σῠν-	together; with, together
9	Ancient Greek	σύν	beside, with
10	Proto-Hellenic	*ksún	beside, with

Every word from Proto-Hellenic *ksún →Every word from Ancient Greek σῠν- →Every word from Ancient Greek συντίθημι →