Etymologically

Etymology and origin of the Spanish word serio

Confidence
Established
Formation
Borrowing
First attested
1626 Corral More words from the 17th century
Borrowed from
Latin serius
Ultimate origin
Latin sērius
Etymology tree
inherited borrowed derived
Latin sērius
Italian serio
Spanish serio
From the same root
Latin serietas ← sērius
Latin sēriō ← sērius
Latin sēriōsus ← sērius
Italian seriamente ← serio

Pronunciation

  • /ˈseɾjo/, [ˈse.ɾjo][1]

Forms

serio (feminine seria, masculine plural serios, feminine plural serias, superlative serísimo)[1]

Etymology

It is borrowed from Latin sērius (“weighty, important, serious”), a learned word first recorded in 1626.[2][3][4][1] Corominas finds it neither in Alonso de Palencia, Nebrija, Casas, Oudin or Covarrubias, nor in the vocabulary of Góngora or the Quijote.[2] In classical Latin the adjective was used of things (the neuter plural meant “serious matters”), while sevērus was used of persons and things;[5][6] Spanish applied it to persons as well.[5][6]

The same Latin word was borrowed as Portuguese sério in the 17th century and as Italian serio.[7][8][1]

De Vaan reconstructs Proto-Italic *sērjo- and Proto-Indo-European *seh₁-ro- (“slow, heavy”), and rejects the older comparison with Germanic words for “heavy” such as Old High German swāri, because an initial /sw/ before a long /eː/ would have kept its /w/ in Latin; he suggests that the word may come from sērus (“slow”), through “tiring” and “heavy” to “weighty”.[9] The OLD still compares the Germanic words.[10]

Earliest recorded meaning

Corominas's first record is in Corral, in 1626.[2][3] Autoridades quotes Corral: „Reiraste, huesped discreto, de que una muger trate contigo de tan serios discursos” “you will laugh, wise guest, that a woman should hold such serious talk with you”.[11]

Semantic evolution

The noun seriedad is recorded earlier than the adjective, in Aldana (died 1578).[2][3] Autoridades defines serio as grave and composed in conduct, stern in look or speech, and real and sincere, without deceit or jest.[11] Terreros opposes it to bufón “jesting” (una pieza seria).[12] The Academy's 1843 edition adds “grave, important” (negocio serio, enfermedad seria) and “solemn”,[13] and the 1869 edition the contrast with comic genres (ópera seria against ópera bufa).[14]

Moliner and the DLE add the senses “not laughing, looking worried or displeased”, “reliable, responsible” and, of clothes and colours, “sober”.[15][4] In Puerto Rico serio “grave, dangerous” is taken as an anglicism after serious.[16] Cuba has enseriarse “to become serious”.[2]

Timeline

  • before 1578 – the noun seriedad in Aldana.[2]
  • 1626 – the first record of serio, in Corral.[2][3]
  • 1726–1739 – Autoridades defines it and quotes Corral.[11]
  • 1760 – the first records from the Americas, in Bogotá.[17]
  • 1843 – the Academy adds “grave, important”.[13]
  • 1869 – the Academy adds the contrast in ópera seria.[14]
  • 1884 – the Academy's dictionary gives the etymology “Del lat. serius”.[18]

Meanings

Adjective

  1. serious, grave, composed in conduct; not given to laughing: Su abuelo era un hombre serio y callado.[4][15][1]
  2. (of an action) Befitting a serious person.[4]
  3. stern in face, look or speech; looking worried or displeased: Se puso serio al oír la noticia.[4][15]
  4. Real, sincere, without deceit or joking.[4][1]
  5. Grave, important: Tuvo un accidente serio.[4][1]
  6. reliable, responsible: un proveedor serio.[15]
  7. (of a genre) Opposed to comic or burlesque: ópera seria.[4]
  8. (of clothes, colours) sober, not showy.[15]

Word family

  • seriedad
  • seriamente
  • enseriar

Usage notes

En serio means “seriously, without joking” (hablar en serio, tomarse en serio).[4][1] The adjective is not related to seriar “to arrange in series”, which is formed from serie.[1]

References

  1. ^ a b c d e f g h i Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g Corominas, Joan; Pascual, José A. (1980–1991), Diccionario crítico etimológico castellano e hispánico, 6 vols., Madrid: Gredos, p. 5, 221
  3. ^ a b c d Corominas, Joan (1973), Breve diccionario etimológico de la lengua castellana, 3rd ed., Madrid: Gredos, p. s.v. serio
  4. ^ a b c d e f g h i Real Academia Española; Asociación de Academias de la Lengua Española (2014–), Diccionario de la lengua española, 23rd ed., online version 23.8, https://dle.rae.es, p. s.v. serio
  5. ^ a b Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  6. ^ a b Bénaben, Michel (2000), Dictionnaire étymologique de l'espagnol, Paris: Ellipses, p. s.v. serio
  7. ^ Cunha, Antônio Geraldo da (2010), Dicionário etimológico da língua portuguesa, 4th ed., Rio de Janeiro: Lexikon, p. 3066
  8. ^ Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. sério
  9. ^ de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  10. ^ Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  11. ^ a b c Real Academia Española (1726–1739), Diccionario de la lengua castellana (Diccionario de Autoridades), 6 vols., Madrid: Francisco del Hierro, p. 6, 96
  12. ^ Terreros y Pando, Esteban de (1786–1793), Diccionario castellano con las voces de ciencias y artes y sus correspondientes de las tres lenguas francesa, latina e italiana, 4 vols., Madrid: Viuda de Ibarra, p. 3, 475
  13. ^ a b Real Academia Española (1843), Diccionario de la lengua castellana, 9th ed., Madrid: Imprenta de D. Francisco María Fernández, p. 664
  14. ^ a b Real Academia Española (1869), Diccionario de la lengua castellana, 11th ed., Madrid: Imprenta de Don Manuel Rivadeneyra, p. 710
  15. ^ a b c d e Moliner, María (2007), Diccionario de uso del español, 3rd ed., Madrid: Gredos, p. s.v. serio
  16. ^ Academia Puertorriqueña de la Lengua Española; Universidad de Puerto Rico, Tesoro lexicográfico del español de Puerto Rico, https://tesoro.pr, p. s.v. serio
  17. ^ Boyd-Bowman, Peter (2003), Léxico hispanoamericano 1493–1993, ed. Ray Harris-Northall and John J. Nitti, New York: Hispanic Seminary of Medieval Studies, p. s.v. serio
  18. ^ Real Academia Española (1884), Diccionario de la lengua castellana, 12th ed., Madrid: Imprenta de D. Gregorio Hernando (the first Academy edition with etymologies), p. 971

Related etymologies

Cite this entry

“Serio.” Etymologically, 7 Nov. 2026, etymologically.com/es/serio. Accessed 7 Nov. 2026.

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