Lexical Definition

‎εἰλικρίνεια‎ eilikríneia (i-lik-ree'-ni-ah) sincerity ^G:N-F
from ‎εἰλικρινής‎

sincerity.

• clearness, i.e. (by implication) purity (figuratively)

Abbott-Smith

** εἰλικρινία (Rec., cl., -κρινεία), -ας, ἡ (< εἰλικρινής), [in LXX: Wi 7:25 A * ;]
sincerity, purity: I Co 5:8, II Co 1:12 2:17.†

Abbott-Smith References

Liddell-Scott-Jones

εἰλικρίνεια-εια [ρῐ], ἡ,

unmixedness, purity, opposed to μίξις, [Refs 4th c.BC+]; in bad sense, unrelievedness, κακοῦ [Refs 1st c.BC+]

__II sincerity, uprightness, [NT+3rd c.AD+]

_{LSJ Scripture Refs: 1Cor.5.8}