Webster's Revised Unabridged Dictionary · 1913

Sincere

Sincere , adjective

[Latin sincerus, of uncertain origin; the first part perhaps akin to sin- in singuli (see Single), and the second to cernere to separate (compare Discern): compare French sincère.]

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. [Obsolete]
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