(1):
(superl.) Honest; free from hypocrisy or dissimulation; as, a sincere friend; a sincere person.
(2):
(superl.) 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.
(3):
(superl.) Pure; unmixed; unadulterated.
(4):
(superl.) Whole; perfect; unhurt; uninjured.