tevékenységébl
tevékenységébl is not a standard Hungarian word; it is generally a misspelling or typographical variant of tevékenységéből, meaning "from his/her activity" or "out of one’s activity." The standard form tevékenységéből is built from tevékenység (activity), the possessive suffix -e (to form tevékenysége, “his/her activity”), and the postpositional suffix -ből (from).
In Hungarian orthography, tevékenységéből correctly expresses a source or origin related to a subject’s activity. The
Usage and avoidance: In formal writing, academic texts, and editorial work, tevékenységéből should be used to
See also: Hungarian orthography, noun stems, possessive forms, suffixes -e and -ből, diacritics in Hungarian.