'Faithlessness' in the Bible
Then Ezra came from before the house of God and went into the lodging place of Jehohanan son of Eliashib [for the night]. There he ate no bread and drank no water, for he mourned over the returned exiles' faithlessness [and violation of God's law].
"Return, O faithless sons, I will heal your faithlessness." "Behold, we come to You; For You are the LORD our God.
[We have been ruined as a nation by our faithlessness and idolatry] for the shameful thing has consumed all for which our fathers toiled from our youth -- "their flocks and their herds, their sons and their daughters.
I will heal their faithlessness; I will love them freely, for My anger is turned away from [Israel].