Etymologically

infamosus

Etymology and origin of the Latin word infamosus

Confidence
Established
Formation
Derivation
First attested
12th century
Ultimate origin
Latin īnfāmis
Etymology tree
inherited borrowed derived
Latin infamis
Latin infamosus
English infamous
From the same root
Latin infamo ← infamis

Pronunciation

  • Classical: [ĩː.faːˈmoː.sʊs][1]
  • Ecclesiastical: [iɱ.faˈmɔː.s̬us][1]

Forms

īnfāmōsus (feminine īnfāmōsa, neuter īnfāmōsum); first/second-declension adjective[1]

Etymology

It is from Latin īnfāmis (“disreputable, infamous”) + -ōsus (“full of”).[1][2] Etymonline analyses it instead as in- (“not”) and fāmōsus (“celebrated”).[3]

Earliest recorded meaning

It is a Medieval Latin word;[2][1] Köbler's first record of it in British sources is from the 12th century.[2][1]

Semantic evolution

It meant “of ill repute, notorious”, of people and of places:[4][1] a manual of procedure in the DMLBS speaks of an accused man seen at night with a suspect or disreputable woman, and a letter describes “most infamous places” that look more like a Stygian marsh than land.[4] In a Polish source it is “slanderous”: Dioscorus, it says, wrote a defamatory pamphlet against the pope, calling him a rotten head.[5]

It is the source of Middle English infamous, at first “not well known” (early 15th century); in the 16th century that word merged with infamis, “of ill repute”, borrowed from Latin īnfāmis, into the English infamous.[3][1]

Timeline

  • 12th century – Köbler's first record in British sources.[2]
  • early 15th century – Middle English infamous is borrowed from it.[3][1]
  • 16th century – English infamous takes on the sense “of ill repute”.[3]

Meanings

Adjective

  1. (Medieval Latin) Of ill repute, notorious, infamous (of people and places).[4][1][2]
  2. (Medieval Latin) Defamatory, slanderous.[5]

References

  1. ^ a b c d e f g h i j Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  3. ^ a b c d Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ a b c 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
  5. ^ a b Lexicon mediae et infimae Latinitatis Polonorum (1953–), Kraków: Instytut Języka Polskiego PAN; electronic ed. elexicon.scriptores.pl

Borrowed into

Cite this entry

“Infamosus.” Etymologically, 24 Oct. 2026, etymologically.com/la/infamosus. Accessed 24 Oct. 2026.

Last edited on . ·