'Slackness' in the Bible

When you make a vow to the Lord your God, you shall not be slack in paying it, for the Lord your God will surely require it of you, and slackness would be sin in you.

Through indolence the rafters sag, and through slackness the house leaks.

from the sound of the stamping of the hoofs of his stallions, from the clattering of his chariots, the noise of their wheels. Fathers do not turn to [their] children because of [the] slackness of [their] hands.

Cursed be he who does the work of the Lord negligently [with slackness, deceitfully]; and cursed be he who keeps back his sword from blood [in executing judgment pronounced by the Lord].

The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.