A — 1: ἄδολος
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(Strong's #97 — Adjective — adolos — ad'-ol-os )

"guileless, pure," is translated "sincere" in 1—Peter 2:2 , AV, "without guile," RV. See GUILELESS , No. 1.

A — 2: γνήσιος
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(Strong's #1103 — Adjective — gnesios — gnay'-see-os )

"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: εἰλικρινής
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(Strong's #1506 — Adjective — eilikrines — i-lik-ree-nace' )

see PURE , A, No. 3.

B — 1: ἁγνῶς
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(Strong's #55 — Adverb — hagnos — hag-noce' )

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 (ver. 16, AV).

C — 1: εἰλικρινεία
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(Strong's #1505 — Noun Feminine — eilikrinia — i-lik-ree'-ni-ah )

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.

2—Corinthians 8:8Ephesians 6:24Titus 2:7