Etymologically

Etymology and origin of the Latin word impurus

Confidence
Established
Formation
Derivation
First attested
c. 250–184 BC Plautus
Ultimate origin
Latin pūrus
Etymology tree
inherited borrowed derived
Latin pūrus
French pur
Italian puro
Spanish puro
Latin impūrus
English impure
Derivations
From the same root
Latin pūrē ← pūrus
Latin pūrgō ← pūrus
Latin pūritās ← pūrus
Latin puriter ← pūrus
Latin pūrō ← pūrus

Pronunciation

  • Classical: [ɪmˈpuː.rʊs][1]
  • Ecclesiastical: [imˈpuː.rus][1]

Forms

impūrus (feminine impūra, neuter impūrum, comparative impūrior, superlative impūrissimus, adverb impūrē); first/second-declension adjective[1]

Etymology

It is from Latin in-2 (“not”) + pūrus (“pure, clean”).[2][3][1]

Earliest recorded meaning

It is found from Plautus on, as a term of abuse: in the Bacchides a character addresses another as “you vile man”.[2][3][4]

Semantic evolution

In Plautus and Terence the word, often in the superlative, was a general insult,[2][3] and in Classical Latin it meant morally foul, especially in sexual conduct.[2][5] The literal sense of dirty or muddy is rare: Propertius has it of muddy places and Ovid of an unclean mother's womb.[2][5]

In Medieval Latin it meant unclean in the literal and in the religious sense, profane or desecrated, and shameful;[6] British writers also used it of adulterated substances in medicine and alchemy.[7] Through Old French it gave English impure, first of muddy wine.[8]

Timeline

  • c. 250–184 BC – Plautus uses it as a term of abuse.[2][4]
  • 190–159 BC – Terence uses the superlative.[3][4]
  • 57/46–12 BC – Propertius uses it of muddy places.[2][4]
  • 43 BC–18 AD – Ovid uses it of an unclean womb.[5][4]
  • c. 120 AD – Florus uses it of poisons used against divine law.[2][4]
  • mid-15th century – English borrows it as impure, of muddy wine.[8]

Meanings

Adjective

  1. Dirty, muddy, unclean.[2][5]
  2. Morally foul, impure, especially in sexual conduct.[2][5]
  3. As a term of abuse: vile, infamous, abominable.[2]
  4. (Medieval Latin) Unclean in the religious sense; profane.[6][9]
  5. (Medieval Latin) Adulterated, of a substance.[7]

Word family

Usage notes

It is also spelled inpurus.[2][5] Lewis & Short compare its near-synonyms obscēnus, spurcus and immundus.[5]

References

  1. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c d Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  4. ^ a b c d e f Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  5. ^ a b c d e f g Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  6. ^ a b Mittellateinisches Wörterbuch bis zum ausgehenden 13. Jahrhundert (1967–), Munich: C. H. Beck; Bayerische Akademie der Wissenschaften
  7. ^ a b Latham, R. E., D. R. Howlett, R. K. Ashdowne, et al. (1975–2013), Dictionary of Medieval Latin from British Sources, London: British Academy / Oxford University Press
  8. ^ a b Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  9. ^ Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson

Borrowed into

Cite this entry

“Impurus.” Etymologically, 7 Nov. 2026, etymologically.com/la/impurus. Accessed 7 Nov. 2026.

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