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From Proto-Indo-European *sem- (confer Latin simplex, and Sanskrit सम (sama, whole, together)) and *ḱer- (grow) (confer Sanskrit किर् (kir, pour out)). According to De Vann, the second part of the compound derives from the unattested adjective *caerus found in the first part of caerimōnia.



sincērus (feminine sincēra, neuter sincērum); first/second declension

  1. clean, pure, sound.
  2. uninjured, whole.
  3. real, natural.
  4. genuine, sincere.


First/second declension.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
nominative sincērus sincēra sincērum sincērī sincērae sincēra
genitive sincērī sincērae sincērī sincērōrum sincērārum sincērōrum
dative sincērō sincērō sincērīs
accusative sincērum sincēram sincērum sincērōs sincērās sincēra
ablative sincērō sincērā sincērō sincērīs
vocative sincēre sincēra sincērum sincērī sincērae sincēra

Related terms[edit]



  • sincerus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • sincerus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • sincerus in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette