Etymologically

Etymology and origin of the Portuguese word sério

Confidence
Established
Formation
Borrowing
First attested
1652 More words from the 17th century
Borrowed from
Latin serius
Ultimate origin
Latin sērius
Etymology tree
inherited borrowed derived
Latin sērius
Italian serio
Portuguese sério
Spanish serio
From the same root
Latin serietas ← sērius
Latin sēriō ← sērius
Latin sēriōsus ← sērius
Italian seriamente ← serio

Pronunciation

  • Brazil: /ˈsɛ.ɾju/[1]
  • Portugal: /ˈsɛ.ɾju/[1]

Forms

sério (feminine séria, masculine plural sérios, feminine plural sérias, comparable, comparative mais sério, superlative o mais sério or seriíssimo or seríssimo, diminutive seriozinho or seriinho, augmentative seriozão or (colloquial) serião)[1]

Etymology

It is borrowed from Latin sērius (“weighty, earnest, serious”), a learned word first recorded in 1652.[2][3][4][5][1] Cunha dates it to the 17th century.[2][3][4][5][1] Houaiss also records a form serioso between 1741 and 1783.[2] Spanish serio, taken from Latin and recorded from 1626, and Italian serio are the same word.[6][1]

De Vaan reconstructs the Latin adjective as *sērjo-, from Proto-Indo-European *seh₁-ro- (“slow, heavy”).[7] The older comparison with Old High German swāri (“heavy”) and a Gothic word for “esteemed”, which the OLD still mentions, would need an initial *sw-, and de Vaan finds no sign of it in the Latin word.[7][8]

Earliest recorded meaning

Houaiss dates the word to 1652 without separate dates for its senses.[2] Bluteau's dictionary, the first to define it, gives “sober, grave”, said of words and speeches, with a quotation from a panegyric of the Marquis of Marialva, and “grave” said of persons.[9] In classical Latin the adjective was used only of things, and severus of persons and things.[10]

Semantic evolution

A private letter of 1762 has the plural sérios.[11] Vieira (1871–1874) defines it as sober and grave, quoting the mock-heroic Hyssope.[12] The noun seriedade is recorded from 1836.[3]

Modern senses run from “not laughing, grave” and “important, deserving attention” to “dangerous” of an illness, “honest, reliable” of a person and “sincere, not pretended” of an intention; of a young man or woman it can mean chaste.[2][13][1] It is also an adverb, “really, seriously”, and a noun naming seriousness and a children's game.[2][14][1]

Timeline

  • 1652 – first record.[2]
  • 1712–1728 – Bluteau defines serio of words and of persons.[9]
  • 1741–1783 – the variant serioso.[2]
  • 1762 – sérios in a private letter.[11]
  • 1836 – first record of seriedade.[3]
  • 1871–1874 – Vieira: sober, grave.[12]

Meanings

Adjective

  1. serious, grave, solemn; not laughing: Ficou sério de repente.[2][13][1]
  2. Important, deserving attention: uma questão séria.[2][5][1]
  3. Of an illness or accident: dangerous, grave.[13][1]
  4. Done with care and rigour: um estudo sério.[2][5]
  5. Honest, reliable, keeping one's commitments: um mecânico sério.[2][13]
  6. Sincere, real, not pretended: A proposta dele é séria.[2][13]
  7. Of dress or manner: sober, austere.[2][5]
  8. Of a person: who keeps to the rules of sexual morality.[2][13]

Adverb

  1. really, seriously, in earnest: Sério, não fui eu.[2][14][13]

Noun

  1. Seriousness, gravity.[2][14]
  2. A children's game in which two people stare at each other until one laughs.[2][13][1]

Word family

  • seriedade
  • seriamente

Usage notes

A sério means “really, in earnest” and also “severely”;[2] levar a sério is “to take seriously” and also “to take offence”;[2] sair do sério is “to lose one's gravity, to laugh” and, by extension, to do something out of the ordinary.[2] Tirar do sério is to exasperate someone.[13][1]

References

  1. ^ a b c d e f g h i j k l m Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m n o p q r s t u Houaiss, Antônio; Villar, Mauro de Salles (2001), Dicionário Houaiss da língua portuguesa, Rio de Janeiro: Objetiva, p. s.v. sério
  3. ^ a b c d Cunha, Antônio Geraldo da (2010), Dicionário etimológico da língua portuguesa, 4th ed., Rio de Janeiro: Lexikon, p. s.v. sério
  4. ^ a b Nascentes, Antenor (1966), Dicionário etimológico resumido, Rio de Janeiro: Instituto Nacional do Livro, p. s.v. sério
  5. ^ a b c d e Ferreira, Aurélio Buarque de Holanda, Novo dicionário Aurélio da língua portuguesa, digital edition, p. s.v. sério
  6. ^ Corominas, Joan (1973), Breve diccionario etimológico de la lengua castellana, 3rd ed., Madrid: Gredos, p. s.v. serio
  7. ^ a b de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  8. ^ Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press, p. s.v. serius
  9. ^ a b Bluteau, Raphael (1712–1728), Vocabulario portuguez e latino, 8 vols. + 2 supplement vols., Coimbra / Lisboa (CLP transcription, Universidade de Aveiro), p. s.v. serio
  10. ^ Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press, p. s.v. serius
  11. ^ a b CLUL (ed.) (2014), P.S. Post Scriptum: Arquivo Digital de Escrita Quotidiana em Portugal e Espanha na Época Moderna, Lisboa: Centro de Linguística da Universidade de Lisboa, http://ps.clul.ul.pt, p. s.v. sério
  12. ^ a b Vieira, Frei Domingos (1871–1874), Grande Diccionario Portuguez ou Thesouro da lingua portugueza, 5 vols., Porto: Ernesto Chardron e Bartholomeu H. de Moraes, p. 5, 502
  13. ^ a b c d e f g h i Academia das Ciências de Lisboa, Dicionário da Língua Portuguesa, revised online edition (2023–) of the Dicionário da Língua Portuguesa Contemporânea (2001), https://dicionario.acad-ciencias.pt, p. s.v. sério
  14. ^ a b c Dicionário Priberam da Língua Portuguesa, Lisboa: Priberam Informática, https://dicionario.priberam.org, p. s.v. sério

Related etymologies

Cite this entry

“Sério.” Etymologically, 15 Nov. 2026, etymologically.com/pt/s%C3%A9rio. Accessed 16 Nov. 2026.

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