Defining The Word Sincere
KJV Usage- bountifulness, liberal (-ity), simplicity, singleness.
Sincerity (SINCER'ITY) n. [L. sinceritas.]
1. Honesty of mind or intention; freedom from simulation or hypocrisy.
2. Freedom from hypocrisy, disguise or false pretense.
Sincere (SINCE'RE) a. [L. sincerus, which is said to be composed of sine, without, and cera, wax; as if applied originally to pure honey.]
1. Pure; unmixed.
3. Being in reality what it appears to be; not feigned; not simulated; not assumed or said for the sake of appearance; real; not hypocritical or pretended.
Sincerely (SINCE'RELY), adv.
Honestly; with real purity of heart; without simulation or disguise.
Old Testament Usage
We do not look just for the word "sincere" in the Old Testament, but when we find it, we look up the definition and then search for the strongs number and see how many times it is used, and where it is used.
OT:8549 tamiym (taw-meem'); from OT:8552;
entire (literally, figuratively or morally); also (as noun) integrity, truth.
KJV Usage - without blemish, complete, full, perfect, sincerely (-ity), sound, without spot, undefiled, upright (-ly), whole.
New Testament Usage
NT:97 adolos (ad'-ol-os); from NT:1 (as a negative particle); and NT:1388;
undeceitful, i.e. (figuratively) unadulterated.
KJV Usage - sincere.
NT:505 anupokritos (an-oo-pok'-ree-tos); from NT:1 (as a negative particle) and a presumed derivative of NT:5271;
undissembled, i.e. sincere.
KJV Usage - without dissimulation (hypocrisy), unfeigned.
NT:1505 eilikrineia (i-lik-ree'-ni-ah); from NT:1506;
clearness, i.e. (by implication) purity (figuratively).
KJV Usage - sincerity.
NT:55 hagnos (hag-noce'); adverb from NT:53;
purely, i.e. honestly.
KJV Usage - sincerely.
NT:572 haplotes (hap-lot'-ace); from NT:573;
singleness, i.e. (subjectively) sincerity (without dissimulation or self-seeking), or (objectively) generosity (copious bestowal).