1. (adj.)slack not tight, taut, firm, or tense; loose: a slack rope.
2. slack negligent; careless; remiss.
3. slack slow, sluggish, or indolent: slack in answering letters.
4. slack not active or busy; dull; not brisk: the slack season in an industry.
5. slack moving very slowly, as the tide, wind, or water.
6. slack weak; lax.
7. (adv.)slack in a slack manner.
8. (n.)slack a slack condition or part.
9. slack the part of a rope, sail, or the like, that hangs loose, without strain upon it.
10. slack a decrease in activity, as in business or work.
11. slack a period of decreased activity.
12. slack a cessation in a strong flow, as of a current.
13. (v.t.)slack to be remiss in respect to (some matter, duty, right, etc.); shirk; leave undone.
14. slack to make or allow to become less active, vigorous, intense, etc.; relax (efforts, labor, speed, etc.) (often fol. by up).
15. slack to make loose, or less tense or taut, as a rope; loosen (often fol. by off or out).
16. (v.i.)slack to be remiss; shirk one's duty or part.
17. slack to become less active, vigorous, rapid, etc. (often fol. by up or off).
18. slack to become less tense or taut, as a rope; ease off.
19. (n.)slack the fine screenings of coal.
Etymology: (1400–50; late ME sleck)
Definition of 'slack'
Princeton's WordNet
1. (noun)slack 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. (noun)slump, slack, drop-off, falloff, falling off a noticeable deterioration in performance or quality "the team went into a slump"; "a gradual slack in output"; "a drop-off in attendance"; "a falloff in quality"
3. (noun)slack, slack water a stretch of water without current or movement "suddenly they were in a slack and the water was motionless"
4. (noun)mire, quagmire, quag, morass, slack a soft wet area of low-lying land that sinks underfoot
5. (noun)slack, slackness the quality of being loose (not taut) "he hadn't counted on the slackness of the rope"
6. (adj)slack a cord or rope or cable that is hanging loosely "he took up the slack"
7. (adj)loose, slack not tense or taut "the old man's skin hung loose and grey"; "slack and wrinkled skin"; "slack sails"; "a slack rope"
9. (verb)lax, slack lacking in rigor or strictness "such lax and slipshod ways are no longer acceptable"; "lax in attending classes"; "slack in maintaining discipline"
10. (verb)slack avoid responsibilities and work, be idle
11. (verb)slack be inattentive to, or neglect "He slacks his attention"
8. slack remiss; backward; not using due diligence or care; not earnest or eager; as, slack in duty or service
9. slack not violent, rapid, or pressing; slow; moderate; easy; as, business is slack
10. (verb)slack alt. of Slacken
Definitions of 'slack'
The New Hacker's Dictionary
1. slack 1. Space allocated to a disk file but not actually used to store
useful information. The techspeak equivalent is ‘internal
fragmentation’. Antonym: hole.
Since Unix files are stored compactly, except for the unavoidable
wastage in the last block or fragment, it might be said that “Unix
has no slack”. See
ha ha only serious.
Definitions of slack 
Afrikaans: slap
Arabic: رَخْو
Bulgarian: отпуснат
Brazilian: frouxo
Czech: volný
German: locker
Danish: slap
Greek: χαλαρός, μπόσικος
Spanish: flojo
Estonian: lõtv
Farsi: سست
Finnish: löysä
French: lâche
Hebrew: רָפוּי
Hindi: ढीला
Croatian: labav, nenapet
Hungarian: laza (kötél)
Indonesian: kendur
Icelandic: slakur
Italian: lento
Japanese: ゆるい
Korean: 느슨한
Lithuanian: neįtemptas, laisvas
Latvian: vaļīgs; nenostiepts
Malay: longgar
Dutch: los
Norwegian: slakk, slapp
Polish: luźny
Persian: سست
Pashto: لټ، سست (پراخ)، غړند، (اص
Portuguese: frouxo
Romanian: neîncordat
Russian: слабый, плохо натянутый
Slovak: voľný
Slovenian: ohlapen
Serbian: labav
Swedish: slak, slack
Thai: หย่อน
Turkish: gevşek
Taiwanese: 鬆弛的
Ukrainian: не натягнутий; ненапружен
Urdu: ڈھیلا ڈھالا
Vietnamese: chùng , lỏng
Chinese: 松驰的
