[ἀφελότης] from a compound of G1 (as a negative particle) and φέλλος (in the sense of a stone as stubbing the foot); smoothness, i.e. (figuratively) simplicity
Usages throughout the bible
Acts 2:46
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And they, continuing daily with one accord in the temple, and breaking bread from house to house, did eat their meat with gladness and singleness G858 of heart,