Source : Webster's Revised Unabridged Dictionary (1913)

Sincere \Sin*cere"\, a. [Compar. {Sincerer}; superl.
   {Sincerest}.] [L. sincerus, of uncertain origin; the first
   part perhaps akin to sin- in singuli (see {Single}), and the
   second to cernere to separate (cf. {Discern}): cf. F.
   sinc[`e]re.]
   1. Pure; unmixed; unadulterated.

            There is no sincere acid in any animal juice.
                                                  --Arbuthnot.

            A joy which never was sincere till now. --Dryden.

   2. Whole; perfect; unhurt; uninjured. [Obs.]

            The inviolable body stood sincere.    --Dryden.

   3. Being in reality what it appears to be; having a character
      which corresponds with the appearance; not falsely
      assumed; genuine; true; real; as, a sincere desire for
      knowledge; a sincere contempt for meanness.

            A sincere intention of pleasing God in all our
            actions.                              --Law.

   4. Honest; free from hypocrisy or dissimulation; as, a
      sincere friend; a sincere person.

            The more sincere you are, the better it will fare
            with you at the great day of account. --Waterland.

   Syn: Honest; unfeigned; unvarnished; real; true; unaffected;
        inartificial; frank; upright. See {Hearty}.