Body

illness

Source:*bolětiProto-Slavic · “to hurt, be ill”certain

Russian боле́знь and BCS bolest are two different nouns from the verb *bolěti; Ukrainian хворо́ба and Polish choroba are twins.

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English

illness

Polish

choroba

xɔˈrɔba

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In all five languages

BCS script

Latin under Cyrillic

Russian
боле́зньboleznʹ
bɐˈlʲeznʲinherited
Ukrainian
хворо́баxvoroba
xʋɔˈrɔbadifferent word · Proto-Slavic *xvorъ 'ill'
Polish
choroba
xɔˈrɔbadifferent word · Proto-Slavic *xvorъ 'ill'
Polish chory 'ill' is the adjective behind it.
Czech
nemoc
ˈnɛmotsdifferent word · Czech ne- + moc 'power': 'lack of strength'
Czech bolest means 'pain', not 'illness'.
Bosnian-Croatian-Serbian
bolestболест
ˈbolestinherited
English
illness