Qualities

blue

Source:*sinjьProto-Slavic · “dark blue”certain

Blue is where the five part ways: синий, niebieski, modrý and plav are three or four different words.

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English

blue

Polish

niebieski

ɲɛˈbjɛskʲi

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In all five languages

BCS script

Latin under Cyrillic

Russian
си́нийsinij
ˈsʲinʲɪjinherited
Russian treats light blue, голубо́й, as a separate basic colour.
Ukrainian
си́нійsynij
ˈsɪnʲijinherited
Блаки́тний is light blue.
Polish
niebieski
ɲɛˈbjɛskʲidifferent word · Polish niebo 'sky': literally 'sky-coloured'
Modry, the cognate of Czech modrý, is poetic in Polish.
Czech
modrý
ˈmodriːdifferent word · Proto-Slavic *modrъ 'blue'
Bosnian-Croatian-Serbian
plavплав
plavdifferent word · Proto-Slavic *polvъ 'pale, straw-coloured'
Plav also means 'blond', true to its pale-yellow origin.
Standard-specific words: modar (Croatian) — The cognate of Czech modrý; used alongside plav.
English
blue