SLACK'NESS, noun 1. Looseness; the state opposite to tension; not tightness or rigidness; as the slackness of a cord or rope. 2. Remissness; negligence; inattention; as the slackness of men in business or duty; slackness in the performance of engagements. 3. Slowness; tardiness; want of tendency; as the slackness of flesh to heal. 4. Weakness; not intenseness.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI