free of deceit, hypocrisy, or falseness; earnest

a sincere apology.

genuine; real

a sincere effort to improve; a sincere friend.

pure; unmixed; unadulterated.

Obsolete . sound; unimpaired.

adjective

dishonest , insincere , tricky , untrustworthy

adjective

aboveboard , actual , artless , bona fide , candid , dead-level , dear , devout , earnest , faithful , forthright , frank , genuine , guileless , heartfelt , honest to god , like it is , meant , natural , no fooling , no-nonsense * , on the level * , on the line , on up and up , open , outspoken , plain , pretensionless , real , regular , righteous , saintly , serious , square * , sure enough , true , true-blue * , trustworthy , twenty-four carat , unaffected , undesigning , undissembled , unfeigned , unpretentious , up-front , wholehearted , hearty , honest , unmannered , authentic , cordial , ingenuous , innocent , pure , truthful , undissembling , virtuous