sincere

From Middle French sincere, from Latin sincerus (“genuine”), from Proto-Indo-European *sin- + *ḱer- (“grow”), from which also Ceres (“goddess of harvest”) from which English cereal.

Unrelated to sine (“without”) cera (“wax”) (folk etymology); see Wikipedia discussion.

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• IPA^(key): /sɪnˈsɪə(ɹ)/
• Rhymes: -ɪə(ɹ)

sincere (comparative more sincere or sincerer, superlative most sincere or sincerest)

1. Genuine; meaning what one says or does; heartfelt.

   I believe he is sincere in his offer to help.

2. Meant truly or earnestly.

   She gave it a sincere, if misguided effort.

3. (archaic) clean; pure

• earnest

• insincere

• cereal
• Ceres
• crescent
• sincerity
• sincereness

• sincere in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• sincere in The Century Dictionary, New York, N.Y.: The Century Co., 1911.

• cereins, ceresin, cerines, renices

sincera +‎ -e

sincere

1. sincerely

• malsincere (“insincerely”)

sincere f pl

1. Feminine plural of adjective sincero.

• censire, crisene, recensì, recinse, scernei, secerni

sincēre

1. vocative masculine singular of sincērus

sincērē (not comparable)

1. uprightly, honestly, frankly, sincerely
   • 1st century, w:Catullus, Poem 109

     Di magni, facite ut vere promittere possit // atque id sincere dicat ex animo

• sincere in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• sincere in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers

First attested in 1441, borrowed from Latin sincērus.[1]

sincere m or f (plural sinceres)

1. sincere (genuinely meaning what one says or does)

• → English: sincere
• French: sincère

sincere

1. First-person singular (yo) present subjunctive form of sincerarse.
2. Formal second-person singular (usted) present subjunctive form of sincerarse.
3. Third-person singular (él, ella, also used with usted^?) present subjunctive form of sincerarse.