Sincere, Sincerely, Sincerity - Vine's Expository Dictionary of New Testament Words
Sincere, Sincerely, Sincerity
[ A-1,Adjective,G97, adolos ]guileless, pure," is translated "sincere" in 1 Peter 2:2, AV, "without guile," RV. See GUILELESS, No. 1.
[ A-2,Adjective,G1103, gnesios ]
"true, genuine, sincere," is used in the neuter, as a noun, with the article, signifying "sincerity," 2 Corinthians 8:8 (of love). See OWN, TRUE.
[ A-3,Adjective,G1506, eilikrines ]
See PURE, A, No. 3.
[ B-1,Adverb,G55, hagnos ]
denotes "with pure motives," akin to words under PURE, A, No. 1, and B, Nos. 1 and 2, and is rendered "sincerely" in Philippians 1:17, RV (Philippians 1:16, AV).
[ C-1,Noun,G1505, eilikrinia ]
akin to A, No. 3 denotes "sincerity, purity;" it is described metaphorically in 1 Corinthians 5:8 as "unleavened (bread);" in 2 Corinthians 1:12, "sincerity (of God)," RV, AV, "(godly) sincerity," it describes a quality possessed by God, as that which is to characterize the conduct of believers; in 2 Corinthians 2:17 it is used of the rightful ministry of the Scriptures.
Notes:
(1) For 2 Corinthians 8:8, See A, No. 2.
(2) In Ephesians 6:24, AV, aphtharsia, "incorruption," is translated "sincerity" (RV, "uncorruptness," AV marg., "incorruption"); some inferior mss. have it in Titus 2:7, AV; the RV follows those in which it is absent.