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Synonyms
slack1 (slăk)

[Middle English slak, from Old English slæc.]

adjective: slack·er, slack·est. 

  1. Moving slowly; sluggish: a slack pace.
  2. Lacking in activity; not busy: a slack season for the travel business.
  3. Not tense or taut; loose: a slack rope; slack muscles. See synonyms at loose
  4. Lacking firmness; flaccid: a slack grip.
  5. Lacking in diligence or due care or concern; negligent: a slack worker. See synonyms at negligent
  6. Flowing or blowing with little speed: a slack current; slack winds.
  7. Linguistics Pronounced with the muscles of the tongue and jaw relatively relaxed; lax.

verb: slacked, slack·ing, slacks. 

transitive verb 

  1. To make slower or looser; slacken.
  2. To be careless or remiss in doing: slack one's duty.
  3. To slake (lime).

intransitive verb 

  1. To be or become slack.
  2. To evade work; shirk.

noun 

  1. A loose part, as of a rope or sail.
  2. A lack of tension; looseness.
  3. A period of little activity; a lull.
    1. A cessation of movement in a current of air or water.
    2. An area of still water.
  5. Unused capacity: still some slack in the economy.
  6. Casual trousers that are not part of a suit.

adverb 

In a slack manner: a banner hanging slack.

phrasal verbs

slack off
To decrease in activity or intensity.

idioms

cut (someone) some slack
Slang To make an allowance for (someone), as in allowing more time to finish something.

derivatives

slacḱly
adverb
slacḱness
noun
slack2 (slăk)

[Middle English sleck.]

noun 

A mixture of coal fragments, coal dust, and dirt that remains after screening coal.
slack3 (slăk)

[Middle English slak, from Old Norse slakki.]

noun 

Chiefly British
  1. A small dell or hollow.
  2. A bog; a morass.