Mind & speech

lie, falsehood

Source:*lъžьProto-Slaviccertain

A clean yer example: the strong *ъ became Russian о, Czech e, BCS a.

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English

lie, falsehood

Polish

kłamstwo

ˈkwamstfɔ

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In all five languages

BCS script

Latin under Cyrillic

Russian
ложьložʹ
loʂinherited
Everyday speech often says непра́вда or враньё.
Ukrainian
брехня́brexnja
brɛxˈnʲadifferent word · Proto-Slavic *brexati 'to bark; to talk nonsense'
Russian бреха́ть 'to bark; to fib' is the cognate.
Polish
kłamstwo
ˈkwamstfɔdifferent word · West Slavic *klamati 'to deceive' (Czech klamat)
The cognate verb łgać 'to lie' survives.
Czech
lež
lɛʃinherited
Bosnian-Croatian-Serbian
lažлаж
laʒinherited
English
lie, falsehood