Qualities

full

Source:*pьlnъProto-Slaviccertain

Syllabic l five ways: пол-, пов-, peł-, pl-, pu-.

I knowI'm learning

English

full

Polish

pełny

ˈpɛwnɨ

Cognate· distant (Indo-European)Same source — the sound laws connect them.

In all five languages

BCS script

Latin under Cyrillic

Russian
по́лныйpolnyj
ˈpolnɨjinherited
Also 'plump, stout'.
Ukrainian
по́внийpovnyj
ˈpɔwnɪjinherited
Polish
pełny
ˈpɛwnɨinherited
Czech
plný
ˈpl̩niːinherited
Bosnian-Croatian-Serbian
punпун
puninherited
English
full
Distant English relative — English full, Latin plenus and *pьlnъ go back to one Indo-European adjective.