Where does “szaleniec” come from?

szaleniec (Polish) comes from Polish szalenie, from Polish -ie, from Old Polish -ie, from Proto-Slavic -ę, from Proto-Indo-European -ę.

szaleniec (Polish): madman, lunatic, mentally unstable person;...

Definitions

Step	Language	Word	Meaning
1	Polish	szalenie	verbal noun of szaleć; enormously
2	Polish	-ie	forms adverbs from adjectives
3	Old Polish	-ie	forms adverbs from adjectives
4	Proto-Slavic	-ę	Forms nouns for young animals and other...
5	Proto-Indo-European	-ę	—