What is the exact meaning of being 'sincere?'?

Question

[no dictionary definitions please]

Answer 1

meaning what you say....when you say "No that doesn't make you look fat" but it does you are not being sincere

Answer 2

Main Entry: sin·cere
Pronunciation: sin-'sir, s&n-
Function: adjective
Inflected Form(s): sin·cer·er; sin·cer·est
Etymology: Middle French, from Latin sincerus whole, pure, genuine, probably from sem- one + -cerus (akin to Latin crescere to grow) -- more at SAME, CRESCENT
1 a : free of dissimulation : HONEST b : free from adulteration : PURE
2 : marked by genuineness : TRUE
- sin·cere·ly adverb
- sin·cere·ness noun
synonyms SINCERE, WHOLEHEARTED, HEARTFELT, HEARTY, UNFEIGNED mean genuine in feeling. SINCERE stresses absence of hypocrisy, feigning, or any falsifying embellishment or exaggeration . WHOLEHEARTED suggests sincerity and earnest devotion without reservation or misgiving . HEARTFELT suggests depth of genuine feeling outwardly expressed . HEARTY suggests honesty, warmth, and exuberance in displaying feeling . UNFEIGNED stresses spontaneity and absence of pretense .