slack

Short definition from Wiktionary

Noun

1. 1
   The part of anything that hangs loose, having no strain upon it.
2. 2
   A dip in a surface.
3. 3
   In particular, a shallow dell or hollow; a dip in the surface of terrain, such as between hills.
4. 4
   A low-lying marsh or a pool, especially a tidal or intermittent one which periodically fills and drains.
5. 5
   Unconditional listening attention given by client to patient.
6. 6
   Attributive form of slacks (“semi-formal trousers”).
7. 7
   A temporary speed restriction where track maintenance or engineering work is being carried out at a particular place.
8. 8
   A valley, or small, shallow dell; a sag or saddle in a ridge.
9. 9
   A flat-bottomed, hollow zone within a sand-dune system that has developed over impervious strata, sometimes due to erosion or blow-out of the dune system; its flat base level is therefore close to or at the permanent water-table level, and therefore has rich, marshy flora, with Salix species (willows) as typical woody colonisers.
10. 10
    Small coal; coal dust.

Adjective

1. 1
   Lax; not tense; not firmly extended.
2. 2
   Weak; not holding fast.
3. 3
   Moderate in some capacity: Moderately warm.
4. 4
   Moderate in some capacity: Moderate in speed.
5. 5
   Lacking diligence or care; not earnest or eager.
6. 6
   Not active or busy, successful, or violent.
7. 7
   Excess; surplus to requirements.
8. 8
   Vulgar; sexually explicit, especially in dancehall music.
9. 9
   Lax.

Adverb

1. 1
   Slackly.

Verb

1. 1
   To slacken.
2. 2
   To mitigate; to reduce the strength of.
3. 3
   To lose cohesion or solidity by a chemical combination with water; to slake.
4. 4
   To refuse to work as hard as one is supposed to.

Proper noun

1. 1
   A surname.
2. 2
   A place in England: A hamlet in Ashover parish, North East Derbyshire district, Derbyshire (OS grid ref SK3362).
3. 3
   A place in England: A hamlet in Heptonstall parish, Metropolitan Borough of Calderdale, West Yorkshire (OS grid ref SD9828).
4. 4
   A place in England: A hamlet in the Metropolitan Borough of Kirklees, near Outlane, West Yorkshire (OS grid ref SE0817).
5. 5
   A real-time collaboration app and platform launched in 2013.