Synonym: baggy, droopy, dull, hanging, inactive, lax, lazy, loose, slow. Antonym: tight. Similar words: slacken, lack, black, flack, lackey, blacken, lacking, black out. Meaning: [slæk] 
n. 1. dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve 2. a noticeable deterioration in performance or quality 3. a stretch of water without current or movement 4. a soft wet area of low-lying land that sinks underfoot 5. the condition of being loose (not taut) 6. a cord or rope or cable that is hanging loosely. v. 1. avoid responsibilities and work, be idle 2. be inattentive to, or neglect 3. release tension on 4. make less active or fast 5. become slow or slower 6. make less active or intense 7. become less in amount or intensity 8. cause to heat and crumble by treatment with water. adj. 1. not tense or taut 2. lacking in strength or firmness or resilience 3. flowing with little speed as e.g. at the turning of the tide 4. lacking in rigor or strictness.
n. 1. dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve 2. a noticeable deterioration in performance or quality 3. a stretch of water without current or movement 4. a soft wet area of low-lying land that sinks underfoot 5. the condition of being loose (not taut) 6. a cord or rope or cable that is hanging loosely. v. 1. avoid responsibilities and work, be idle 2. be inattentive to, or neglect 3. release tension on 4. make less active or fast 5. become slow or slower 6. make less active or intense 7. become less in amount or intensity 8. cause to heat and crumble by treatment with water. adj. 1. not tense or taut 2. lacking in strength or firmness or resilience 3. flowing with little speed as e.g. at the turning of the tide 4. lacking in rigor or strictness. 
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1. The boxer's jaw went slack.
2. The string around the parcel was slack.
3. He tightened a few slack screws.
4. She was staring into space, her mouth slack.
5. The rope suddenly went slack.
6. Let the reins go slack.
7. These tent ropes are too slack - they need tightening.
8. Keep the rope slack until I tell you to pull it.
9. Slack off those ropes there ; there's a storm coming!
10. Slack up the tent ropes before it rains.
11. Don't get slack about doing yourexercises.
12. Trade is slack this week.
13. Many publishers have simply become far too slack.
14. Your grip on the bar is too slack.
15. There's too much slack in the tow rope.
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16. The antiques business remained slack.
17. Discipline in Mr.Brown's class becomes very slack.
18. Discipline in the classroom is very slack.
19. Freight - car loadings continue to slack off.
20. Business is always slack at this time of year.
21. He pulled in the slack of the rope.
22. There is still some slack in the budget.
23. There's very little slack in the budget.
24. Slack off / up as youapproach the junction.
25. Organization of the conference was rather slack.
26. Trade is slack in winter.
27. Leave the thread slightly slack to allow for movement.
28. Slack off your speed as you approach the corner.
29. The boy's jaw went slack.
30. Some of the ropes were completely slack.
More similar words: slacken, lack, black, flack, lackey, blacken, lacking, black out, for lack of, blackleg, blacking, jet black, blackball, black hand, black hole, in the black, black list, black sheep, blackbody, blackface, blackmail, blacklist, blackness, lacklustre, blacksmith, lackluster, a black sheep, blackberry, black magic, black horse.