sincere (Middle French)

Where does "sincere" come from?

The English word 'sincere' is a borrowing from Middle French that first appeared in 1441[1]. It traces its roots back to the Latin adjective 'sincērus', meaning genuinely what one says or does[1][2]. The ultimate origin of 'sincērus' is complex and remains a subject of linguistic debate regarding its Proto-Italic ancestor '*senkairos'[2].

Open questions

• The derivation from Proto-Italic *senkairos is problematic because the expected phonetic development of the vowel cluster would result in *sincīrus rather than the attested *sincērus. [2]
• The second element of the Latin compound is associated with an unattested adjective *caerus, which itself remains speculative. [2]

Full etymology tree

• sincere (Middle French), 'sincere (genuinely meaning what one says or does)'
  • borrowed sincerus (Latin), 'clean, pure, sound'

Ancestors

• sincerus (Latin)

Descendants and derived words

• sincere (English)
• sincère (French)

Sources

1. sincere (Middle French) - Wiktionary
2. sincerus (Latin) - Wiktionary

Updated August 2026

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Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris