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From Biology-Online Dictionary | Biology-Online Dictionary
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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. 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)

Synonym: honest, unfeigned, unvarnished, real, true, unaffected, inartificial, frank, upright. See hearty.

Origin: 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. Sincere.