sincere (adjective) sincere: straightforward, honest
Sinonime: 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
Antonime: dishonest,
insincere,
tricky,
untrustworthy