1. (superl.) Pure; unmixed; unadulterated.

2. (superl.) Whole; perfect; unhurt; uninjured.

3. (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.

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

abandoned aboveboard actual afire ardent artless authentic bluff blunt bona fide born yesterday bound bound and determined broad brusque burning candid card-carrying childlike committed confiding dear decided decisive dedicated definite determined devoted devout dinkum direct downright earnest explicit faithful fervent fervid fiery flaming following the letter forthright frank frankhearted free free-speaking free-spoken free-tongued genuine good guileless heart-to-heart heartfelt hearty heated honest honest-to-God hot hot-blooded impassioned in earnest inartificial ingenu ingenuous innocent intense intent intent on lawful legitimate lifelike literal loyal meant naive natural naturalistic obstinate on fire on the level open openhearted original outspoken passionate perfervid persevering persistent plain plain-spoken pure purposeful real realistic red-hot relentless resolute resolved rightful round serious simon-pure simple simplehearted simpleminded single-hearted single-minded spirited sterling straight straight-out straightforward sure-enough tenacious transparent TRUE true to life true to nature true to reality trustful trusting truthful unadulterated unaffected unassumed unassuming unchecked uncolored unconcocted unconstrained uncopied uncounterfeited undesigning undisguised undisguising undissembled undissembling undistorted unequivocal unexaggerated unfabricated unfanciful unfeigned unfeigning unfictitious unflattering unguarded unimagined unimitated uninvented unpretended unpretending unpretentious unqualified unreserved unrestrained unromantic unsimulated unsophisticated unspecious unsuspicious unsynthetic unvarnished unwary vehement veracious verbal verbatim veridical verisimilar warm white-hot wholehearted word-for-word zealous