- (n.) Small coal; also, coal dust; culm.
- (superl.) Lax; not tense; not hard drawn; not firmly extended; as, a slack rope.
- (adv.) Slackly; as, slack dried hops.
- (superl.) Weak; not holding fast; as, a slack hand.
- (superl.) Not violent, rapid or pressing; slow; moderate; easy; as, business is slack.
- (a.) Alternative of Slacken.
- (v.t.) Alternative of Slacken.
- (superl.) Remiss; backward; not using due diligence or care; not earnest or eager; as, slack in duty or service.
- (n.) A valley or small, shallow dell.
- (n.) The part of anything that hangs loose, having no strain upon it; as, the slack of a rope or of a sail.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). slack. Retrieved September 20, 2026, from http://smartdefine.org/slack/definitions/2062729 |
| Chicago | Webster's. 2011. "slack" http://smartdefine.org/slack/definitions/2062729 (accessed September 20, 2026). |
| Harvard | Webster's 2011, slack, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/slack/definitions/2062729>. |
| MLA | Webster's. "slack" 28 May 2011. Web. 20 September 2026. <http://smartdefine.org/slack/definitions/2062729> |