mortal sin

noun

A sin which causes the loss of God's grace, leading to eternal damnation, unless the sinner repents, which includes their intent to confess and atone; such a sin is defined as a grave transgression against one of the Ten Commandments with the full knowledge and deliberate consent of the sinner.

Similar
deadly sin
Opposite
venial sin
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Meanings

nounmortal sin (countable and uncountable, plural mortal sins)

plural mortal sins

  1. countableuncountableCatholicismA sin which causes the loss of God's grace, leading to eternal damnation, unless the sinner repents, which includes their intent to confess and atone; such a sin is defined as a grave transgression against one of the Ten Commandments with the full knowledge and deliberate consent of the sinner.

    Antonyms: venial sin

Synonyms & antonyms

nounA sin which causes the loss of God's grace, leading to eternal damnation, unless the sinner repents, which includes their intent to confess and atone; such a sin is defined as a grave transgression against one of the Ten Commandments with the full knowledge and deliberate consent of the sinner.

Opposite
venial sin

More synonyms by meaning

nounan unpardonable sin entailing a total loss of grace

Similar
deadly sin
Opposite
venial sin
Broader
sinsinning
Also see
deadly sin

Synonym sets from Open English WordNet, CC BY 4.0.

Translations

Basque bekatu astun
  • bekatu astungrave sin
Catalan pecat mortal
  • pecat mortalgrave sin
Czech smrtelný hřích
  • smrtelný hříchgrave sin
Dutch doodzonde
  • doodzondegrave sin
Esperanto morta peko
  • morta pekograve sin
Finnish kuolemansynti
  • kuolemansyntigrave sin
French péché grave, péché mortel
  • péché gravegrave sin
  • péché mortelgrave sin
German Todsünde
  • Todsündegrave sin
Hungarian halálos bűn
  • halálos bűngrave sin
Indonesian dosa berat
  • dosa beratgrave sin
Irish peaca marfach
  • peaca marfachgrave sin
Italian peccato mortale
  • peccato mortalegrave sin
Japanese 大罪
  • 大罪 (taizai)grave sin
Korean 대죄
  • 대죄 (daejoe)grave sin
Polish grzech śmiertelny, grzech ciężki
  • grzech śmiertelnygrave sin
  • grzech ciężkigrave sin
Portuguese pecado mortal
  • pecado mortalgrave sin
Russian сме́ртный грех
  • сме́ртный грех (smértnyj grex)grave sin
Scottish Gaelic peacadh-bàis
  • peacadh-bàisgrave sin
Spanish pecado mortal
  • pecado mortalgrave sin
Swedish dödssynd
  • dödssyndgrave sin
Tagalog kasalanang mortal, kasalanang mabigat
  • kasalanang mortalgrave sin
  • kasalanang mabigatgrave sin
Turkish büyük günah
  • büyük günahgrave sin
Vietnamese tội trọng
  • tội trọnggrave sin
Welsh pechod marwol
  • pechod marwolgrave sin
Cite this entry
APA

mortal sin. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/mortal%20sin

MLA

“mortal sin.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/mortal%20sin. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “mortal sin,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/mortal%20sin.

Source: mortal sin on Wiktionary, CC BY-SA 4.0.