Where does “legeffektívebb” come from?

legeffektívebb (Hungarian) comes from Hungarian effektívebb, from Hungarian effektív, from German effektiv, from French effectif, from Latin effectīvus, from Latin efficiō, from Latin ex, from Latin commūnicō — whale, sea monster; abyss.

Ancestry of “legeffektívebb”, step by step

Step	Language	Word	Meaning
1	Hungarian	effektívebb	—
2	Hungarian	effektív	effective
3	German	effektiv	effective; actual
4	French	effectif	number of members of a group; lineup; real,...
5	Latin	effectīvus	creative
6	Latin	efficiō	to make out or work out; effect, execute, complete, accomplish, make, form, compose
7	Latin	ex	A name of the letter "X"; out of, from
8	Latin	commūnicō	to impart, share
9	Latin	commūnis	common, commonplace, ordinary, general, universal, shared, shared alike, of both sides, belonging to two or more together
10	Old Latin	com(m)oinis	—
11	Proto-Italic	kommoinis	common
12	Proto-Indo-European	ḱom-moy-ni-	held in common
13	Proto-Indo-European	ḱóm	beside, near, by, with
14	Proto-Indo-European	ḱe	Deictic particle, here; Post-positional...
15	Middle English	kyt	—
16	Russian	кит	whale; genitive plural of ки́та
17	Old Church Slavonic	китъ	whale
18	Ancient Greek	κῆτος	whale, sea monster; abyss

Every word from Ancient Greek κῆτος →Every word from Old Church Slavonic китъ →Every word from Russian кит →