What is remiss; backward; not using due diligence or care; not earnest or eager; as, slack in duty or service. The Lord is not slack concerning his promise, as some men count slackness. 2 Pet. iii called?

slack — Remiss; backward; not using due diligence or care; not earnest or eager; as, slack in duty or service. The Lord is not slack concerning his promise, as some men count slackness. 2 Pet. iii. (Webster's 1913.)