Reconstruction:Proto-Slavic/koristьnъ

This Proto-Slavic entry contains reconstructed terms and roots. As such, the term(s) in this entry are not directly attested, but are hypothesized to have existed based on comparative evidence.

Proto-Slavic

Etymology

From *koristь +‎ *-ьnъ.

Adjective

*koristьnъ^[1]

useful, beneficial

Inflection

Indefinite declension of *koristьnъ (hard)

singular	masculine	feminine	neuter
nominative	*koristьnъ	*koristьna	*koristьno
genitive	*koristьna	*koristьny	*koristьna
dative	*koristьnu	*koristьně	*koristьnu
accusative	*koristьnъ	*koristьnǫ	*koristьno
instrumental	*koristьnomь	*koristьnojǫ	*koristьnomь
locative	*koristьně	*koristьně	*koristьně
vocative	*koristьne	*koristьno	*koristьno
dual	masculine	feminine	neuter
nominative	*koristьna	*koristьně	*koristьně
genitive	*koristьnu	*koristьnu	*koristьnu
dative	*koristьnoma	*koristьnama	*koristьnoma
accusative	*koristьna	*koristьně	*koristьně
instrumental	*koristьnoma	*koristьnama	*koristьnoma
locative	*koristьnu	*koristьnu	*koristьnu
vocative	*koristьna	*koristьně	*koristьně
plural	masculine	feminine	neuter
nominative	*koristьni	*koristьny	*koristьna
genitive	*koristьnъ	*koristьnъ	*koristьnъ
dative	*koristьnomъ	*koristьnamъ	*koristьnomъ
accusative	*koristьny	*koristьny	*koristьna
instrumental	*koristьny	*koristьnami	*koristьny
locative	*koristьněxъ	*koristьnaxъ	*koristьněxъ
vocative	*koristьni	*koristьny	*koristьna

Definite declension of *koristьnъ (hard)

singular	masculine	feminine	neuter
nominative	*koristьnъjь	*koristьnaja	*koristьnoje
genitive	*koristьnajego	*koristьnyję̇	*koristьnajego
dative	*koristьnujemu	*koristьněji	*koristьnujemu
accusative	*koristьnъjь	*koristьnǫjǫ	*koristьnoje
instrumental	*koristьnyjimь	*koristьnǫjǫ	*koristьnyjimь
locative	*koristьnějemь	*koristьněji	*koristьnějemь
vocative	*koristьnъjь	*koristьnaja	*koristьnoje
dual	masculine	feminine	neuter
nominative	*koristьnaja	*koristьněji	*koristьněji
genitive	*koristьnuju	*koristьnuju	*koristьnuju
dative	*koristьnyjima	*koristьnyjima	*koristьnyjima
accusative	*koristьnaja	*koristьněji	*koristьněji
instrumental	*koristьnyjima	*koristьnyjima	*koristьnyjima
locative	*koristьnuju	*koristьnuju	*koristьnuju
vocative	*koristьnaja	*koristьněji	*koristьněji
plural	masculine	feminine	neuter
nominative	*koristьniji	*koristьnyję̇	*koristьnaja
genitive	*koristьnъjixъ	*koristьnъjixъ	*koristьnъjixъ
dative	*koristьnyjimъ	*koristьnyjimъ	*koristьnyjimъ
accusative	*koristьnyję̇	*koristьnyję̇	*koristьnaja
instrumental	*koristьnyjimi	*koristьnyjimi	*koristьnyjimi
locative	*koristьnyjixъ	*koristьnyjixъ	*koristьnyjixъ
vocative	*koristьniji	*koristьnyję̇	*koristьnaja

Descendants

East Slavic:
- Belarusian: кары́сны (karýsny)
- Russian: коры́стный (korýstnyj)
- Ukrainian: кори́сний (korýsnyj), ко́рисний (kórysnyj)
South Slavic:
- Old Church Slavonic:
  Old Cyrillic script: користьнъ (koristĭnŭ)
- Bulgarian: ко̀ристен (kòristen)
- Serbo-Croatian:
  Cyrillic script: ко̏рӣстан
  
  Latin script: kȍrīstan
- Slovene: korísten (tonal orthography)
West Slavic:
- Czech: kořistný
- Old Polish: korzysny, korzystny
  - Polish: korzystny
- Slovak: koristný

References

^ Trubachyov, Oleg, editor (1984), “*koristьnъ”, in Этимологический словарь славянских языков [Etymological dictionary of Slavic languages] (in Russian), numbers 11 (*konьcь – *kotьna(ja)), Moscow: Nauka, page 73

[1] Trubachyov, Oleg, editor (1984), “*koristьnъ”, in Этимологический словарь славянских языков [Etymological dictionary of Slavic languages] (in Russian), numbers 11 (*konьcь – *kotьna(ja)), Moscow: Nauka, page 73

[1]