Reconstruction:Proto-Slavic/bojьkъ

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

Form an earlier u-stem adjective *bojъ +‎ *-ьkъ, from Proto-Indo-European *bʰeyh₂- (“to fight”). Formally equivalent to Lithuanian bajùs (“terrible”),^[1] which is from the same PIE root but from another meaning to frighten (whence are Proto-Slavic *bojati (“to fear”), *bojaznь (“fear”)). The later is attested relatively late, though.

Adjective

*bojьkъ

feisty, ready for fight
brisky, energetic

Inflection

Indefinite declension of *bojьkъ (hard)
singular	masculine	feminine	neuter
nominative	**bojьkъ	**bojьka	**bojьko
genitive	**bojьka	**bojьky	**bojьka
dative	**bojьku	**bojьcě	**bojьku
accusative	**bojьkъ	**bojьkǫ	**bojьko
instrumental	**bojьkomь	**bojьkojǫ	**bojьkomь
locative	**bojьcě	**bojьcě	**bojьcě
vocative	**bojьče	**bojьko	**bojьko
dual	masculine	feminine	neuter
nominative	**bojьka	**bojьcě	**bojьcě
genitive	**bojьku	**bojьku	**bojьku
dative	**bojьkoma	**bojьkama	**bojьkoma
accusative	**bojьka	**bojьcě	**bojьcě
instrumental	**bojьkoma	**bojьkama	**bojьkoma
locative	**bojьku	**bojьku	**bojьku
vocative	**bojьka	**bojьcě	**bojьcě
plural	masculine	feminine	neuter
nominative	**bojьci	**bojьky	**bojьka
genitive	**bojьkъ	**bojьkъ	**bojьkъ
dative	**bojьkomъ	**bojьkamъ	**bojьkomъ
accusative	**bojьky	**bojьky	**bojьka
instrumental	**bojьky	**bojьkami	**bojьky
locative	**bojьcěxъ	**bojьkaxъ	**bojьcěxъ
vocative	**bojьci	**bojьky	**bojьka

Definite declension of *bojьkъ (hard)
singular	masculine	feminine	neuter
nominative	**bojьkъjь	**bojьkaja	**bojьkoje
genitive	**bojьkajego	**bojьkyję̇	**bojьkajego
dative	**bojьkujemu	**bojьcěji	**bojьkujemu
accusative	**bojьkъjь	**bojьkǫjǫ	**bojьkoje
instrumental	**bojьkyjimь	**bojьkǫjǫ	**bojьkyjimь
locative	**bojьcějemь	**bojьcěji	**bojьcějemь
vocative	**bojьkъjь	**bojьkaja	**bojьkoje
dual	masculine	feminine	neuter
nominative	**bojьkaja	**bojьcěji	**bojьcěji
genitive	**bojьkuju	**bojьkuju	**bojьkuju
dative	**bojьkyjima	**bojьkyjima	**bojьkyjima
accusative	**bojьkaja	**bojьcěji	**bojьcěji
instrumental	**bojьkyjima	**bojьkyjima	**bojьkyjima
locative	**bojьkuju	**bojьkuju	**bojьkuju
vocative	**bojьkaja	**bojьcěji	**bojьcěji
plural	masculine	feminine	neuter
nominative	**bojьciji	**bojьkyję̇	**bojьkaja
genitive	**bojьkъjixъ	**bojьkъjixъ	**bojьkъjixъ
dative	**bojьkyjimъ	**bojьkyjimъ	**bojьkyjimъ
accusative	**bojьkyję̇	**bojьkyję̇	**bojьkaja
instrumental	**bojьkyjimi	**bojьkyjimi	**bojьkyjimi
locative	**bojьkyjixъ	**bojьkyjixъ	**bojьkyjixъ
vocative	**bojьciji	**bojьkyję̇	**bojьkaja

Related terms

*bojь (“fight”)
*bojьcь (“fighter”)
*bojьnъ (“military”)
*bojevъ (“feisty, military”)

Descendants

East Slavic:
- Russian: бо́йкий (bójkij)
- Ukrainian: бійкий (bijkyj)
South Slavic:
- Bulgarian: бояк (bojak)
  - ⇒ Bulgarian: бойко (bojko, “bravely, energetically”) (adverb)
- Serbo-Croatian:
  Cyrillic script: бо̀јак
  
  Latin script: bòjak

References

^ Derksen, Rick (2015) “bajus”, in Etymological Dictionary of the Baltic Inherited Lexicon (Leiden Indo-European Etymological Dictionary Series; 13), Leiden, Boston: Brill, →ISBN, page 77

[1] Derksen, Rick (2015) “bajus”, in Etymological Dictionary of the Baltic Inherited Lexicon (Leiden Indo-European Etymological Dictionary Series; 13), Leiden, Boston: Brill, →ISBN, page 77

[1]