Reconstruction:Proto-Slavic/grěxъ

Potentially a conflation of more than one semantic kernels:^[1]

• Derksen, Mladenov, Vasmer, Trubačev, Snoj: From an earlier *grēxŭ, stemming from *grěti (“to heat”) +‎ *-xъ, based on related terms conveying thermal states: dial. Bulgarian гря́шка (grjáška, “scorch, fever”), dial. Russian гре́шина (gréšina, “blaze”). Perhaps originally implying “fervour, ardour” → “guilt”.
• Iljinsky, Endzelīns: From an earlier *grai(k)śŭ, related to Lithuanian graižùs (“winding, crooked”), Latvian grèizs (“crooked, slanting, diagonal”) and possibly Proto-Slavic *grěza (“delirium, confusion”). Originally referring to “skewness, misalignment” > “error”. Such a meaning is reflected in agricultural vocabulary: cf. dial. Polish grzecha, ogrzech (“a vacant strip in a sown field or a piece of land not ploughed by the ploughman's carelessness”), dial. Russian грехва (grexva), о́грех (ógrex), Ukrainian о́грех (óhrex, “place not ploughed or badly ploughed”), dial. Belarusian грэх (hrex, “a field that has been missed by sowing or ploughing”). Additionally, in South Slavic (except for Slovene) the principal word for “mistake” is the diminutive form of *grěxъ. For meaning shift compare *krivъ (“crooked, bent; wrong”) : *krivьda (“evil, injustice”); Latin scelus (< Proto-Indo-European *(s)kel- (“to curve, bend”)).
• Proposed further cognates: Akin to Ancient Greek χρεῖος (khreîos, “liability, debt, need”) (Pedersen) or Ancient Greek χρῑ́ω (khrī́ō, “to smear, to anoint”), χροΐζω (khroḯzō, “to concern”) (Berneker).

*grě̃xъ m^{[1][2][3][4][5]}

1. per etymology from early *grēxŭ:
   1. fervour, ardour (damaging thermal state)
   2. (secondary) guilt, grief, regret
2. per etymology from early *grai(k)śŭ:
   1. error, mistake, misconduct

      Synonym: *xyba

Modern descendants generally bear the abstract meaning “sin”. It arose post-Proto-Slavic, under the influence of Christianity, and is a calque of Latin and Greek terms: compare Latin peccātum (“error, mistake, deficiency; sin”), peccāre (“to trip, stumble; to transgress”), Ancient Greek ἁμαρτάνω (hamartánō, “to miss; to fail, sin”), ἁμαρτία (hamartía, “error, mistake; guilt, sin”).

Per Sławski and Jakubowicz the word originally belonged to u-stem, as evidenced by Old Church Slavonic грѣховъ (grěxovŭ, genitive plural) and adjective грѣховьнъ (grěxovĭnŭ).

• East Slavic:
  • Old East Slavic: грѣхъ (grěxŭ)
    • Old Ruthenian: грѣхъ (hrěx)
      • Belarusian: грэх (hrex)
      • Carpathian Rusyn: грїх (hrjix)
      • Ukrainian: гріх (hrix); грєх (hrjex) (dialectal)
    • Russian: грех (grex)
    • → Latvian: grēks
  • Old Novgorodian: грѣхе (grěxe)
    • → Finnic:
      • Finnish: räähkä
      • Karelian: reähkä
        • → Sami:
          • Kildin Sami:
          • Skolt Sami: rĕä̆ʹkkĕ
          • Ter Sami:
      • Ludian: riehke̮, riehk
• South Slavic:
  • Old Church Slavonic:

    Old Cyrillic script: грѣхъ (grěxŭ)

    Glagolitic script: ⰳⱃⱑⱈⱏ (grěxŭ)

    • → Old Komi: 𐍚𐍠𐍔𐍚𐍐 (kreka)
  • Bulgarian: грях (grjah), грех (greh)
  • Macedonian: грев (grev)
  • Serbo-Croatian:

    Cyrillic script: гре̑х, грије̑х, грих

    Latin script: grȇh, grijȇh, grih

  • Slovene: grẹ́h (tonal orthography)
• West Slavic:
  • Old Czech: hřiech
    • Czech: hřích
  • Polabian: greχ
  • Old Polish: grzech
    • Polish: grzech
    • Silesian: grzych
  • Old Slovak: hréch, hriech, hrích
    • Pannonian Rusyn: грих (hrix)
    • Slovak: hriech
  • Pomeranian:
    • Kashubian: grzéch
    • Slovincian: grzéch
  • Sorbian:
    • Lower Sorbian: grěch
    • Upper Sorbian: hrěch

• Anikin, A. E. (2018), “грешина”, in Русский этимологический словарь [Russian Etymological Dictionary] (in Russian), issue 12 (грак – дбать), Moscow: Nestor-Historia, →ISBN, page 93
• Vasmer, Max (1964–1973), “грех”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress
• Boryś, Wiesław (2005), “grzech”, in Słownik etymologiczny języka polskiego (in Polish), Kraków: Wydawnictwo Literackie, →ISBN, page 185
• The template Template:R:zle-mbe:HSBM does not use the parameter(s):

  url=greh

  Please see Module:checkparams for help with this warning.Zhurawski, A. I., editor (1986), “грѣхъ”, in Гістарычны слоўнік беларускай мовы [Historical Dictionary of the Belarusian Language] (in Belarusian), numbers 7 (гляденье – девичество), Minsk: Navuka i tekhnika, page 148
• Brückner, Aleksander (1927), “grzech”, in Słownik etymologiczny języka polskiego [Etymological Dictionary of the Polish Language] (in Polish), Warsaw: Wiedza Powszechna, page 161
• Melnychuk, O. S., editor (1982–2012), “гріх”, in Етимологічний словник української мови [Etymological Dictionary of the Ukrainian Language] (in Ukrainian), Kyiv: Naukova Dumka
• Georgiev, Vladimir I., editor (1971), “грях”, in Български етимологичен речник [Bulgarian Etymological Dictionary] (in Bulgarian), volume 1 (А – З), Sofia: Bulgarian Academy of Sciences Pubg. House, →ISBN, page 290
• Yelena Aleksandrovna Potekhina (2012), “Cемантика и прагматика религиозного текста (на материале рукописи «Чин исповеданию» из собрания бывшего старообрядческого монастыря в Войнове)”, in Language and Method, volume 1, →ISSN