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Slack vs. Lack — What's the Difference?

Difference Between Slack and Lack

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Definitions

Slack

Not taut or held tightly in position; loose
A slack rope
Her mouth went slack

Lack

Deficiency or absence
Lack of funding brought the project to a halt.

Slack

(of business or trade) characterized by a lack of work or activity; quiet
Business was rather slack

Lack

A particular deficiency or absence
Owing to a lack of supporters, the reforms did not succeed.

Slack

Having or showing laziness or negligence
Slack accounting procedures
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Lack

To be without or in need of
Lacked the strength to lift the box.

Slack

Lewd
The veteran king of slack chat

Lack

To be missing or deficient
We suspected that he was lying, but proof was lacking.

Slack

(of a tide) neither ebbing nor flowing
Soon the water will become slack, and the tide will turn
Slack tides

Lack

To be in need of something
She does not lack for friends.
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Slack

The part of a rope or line which is not held taut; the loose or unused part
I picked up the rod and wound in the slack

Lack

A deficiency or need (of something desirable or necessary); an absence, want.

Slack

Casual trousers
He put on a grey shirt and loose cotton slacks

Lack

(obsolete) A defect or failing; moral or spiritual degeneracy.

Slack

A spell of inactivity or laziness
He slept deeply, refreshed by a little slack in the daily routine

Lack

(transitive) To be without, to need, to require.
My life lacks excitement.

Slack

Coal dust or small pieces of coal
The fire was stoked with a mixture of slack and cement

Lack

(intransitive) To be short (of or for something).
He'll never lack for company while he's got all that money.

Slack

Loosen (something, especially a rope)
Slacking the outhaul allows you to adjust the sail

Lack

To be in want.

Slack

Decrease or reduce in intensity, quantity, or speed
The horse slacked his pace
The flow of blood slacked off

Lack

(obsolete) To see the deficiency in (someone or something); to find fault with, to malign, reproach.

Slack

Work slowly or lazily
She ticked off her girls if they were slacking

Lack

Blame; cause of blame; fault; crime; offense.

Slack

Slake (lime)
150 sacks of lime were slacked by the inrushing water

Lack

Deficiency; want; need; destitution; failure; as, a lack of sufficient food.
She swooneth now and now for lakke of blood.
Let his lack of years be no impediment.

Slack

Not tense or taut; loose
A slack rope.
Slack muscles.

Lack

To blame; to find fault with.
Love them and lakke them not.

Slack

Lacking in activity; not busy
A slack season for the travel business.

Lack

To be without or destitute of; to want; to need.
If any of you lack wisdom, let him ask of God.

Slack

Moving slowly; sluggish
A slack pace.

Lack

To be wanting; often, impersonally, with of, meaning, to be less than, short, not quite, etc.
What hour now?I think it lacks of twelve.
Peradventure there shall lack five of the fifty.

Slack

Lacking in diligence or due care or concern; negligent
A slack worker.

Lack

To be in want.
The young lions do lack, and suffer hunger.

Slack

Flowing or blowing with little speed
A slack current.
Slack winds.

Lack

Exclamation of regret or surprise.

Slack

(Linguistics) Pronounced with the muscles of the tongue and jaw relatively relaxed; lax.

Lack

The state of needing something that is absent or unavailable;
There is a serious lack of insight into the problem
Water is the critical deficiency in desert regions
For want of a nail the shoe was lost

Slack

To make looser or less taut
Slacked the sail.

Lack

Be without;
This soup lacks salt
There is something missing in my jewellery box!

Slack

To make slower
Slacked our pace.

Slack

To be careless or remiss in doing
Slack one's duty.

Slack

To slake (lime).

Slack

To be or become slack.

Slack

To be inactive or avoid work
Slacked around the house all day.

Slack

A loose part, as of a rope or sail
Hauled in the slack.

Slack

A period of little activity; a lull
A slack in business.

Slack

A cessation of movement in a current of air or water.

Slack

An area of still water.

Slack

Unused capacity
Still some slack in the economy.

Slack

Slacks Casual pants that are not part of a suit.

Slack

A mixture of coal fragments, coal dust, and dirt that remains after screening coal.

Slack

A small dell or hollow.

Slack

A bog; a morass.

Slack

In a slack manner
A banner hanging slack.

Slack

(uncountable) The part of anything that hangs loose, having no strain upon it.
The slack of a rope or of a sail
Take in the slack

Slack

(countable) A tidal marsh or shallow that periodically fills and drains.

Slack

Unconditional listening attention given by client to patient.

Slack

(rail) A temporary speed restriction where track maintenance or engineering work is being carried out at a particular place.

Slack

(countable) A valley, or small, shallow dell.

Slack

(mining) Small coal; coal dust.

Slack

(normally said of a rope) Lax; not tense; not firmly extended.
A slack rope

Slack

Weak; not holding fast.
A slack hand

Slack

Moderate in some capacity.

Slack

Moderately warm.
A slack oven

Slack

Moderate in speed.
A slack wind

Slack

Lacking diligence or care; not earnest or eager.
Slack in duty or service

Slack

Not active or busy, successful, or violent.
Business is slack.

Slack

Excess; surplus to requirements.
The slack capacity of an oil pipeline

Slack

Vulgar; sexually explicit, especially in dancehall music.

Slack

(linguistics) Lax.

Slack

Slackly.
Slack dried hops

Slack

To slacken.

Slack

(obsolete) To mitigate; to reduce the strength of.

Slack

To lose cohesion or solidity by a chemical combination with water; to slake.
Lime slacks.

Slack

Small coal; also, coal dust; culm.

Slack

A valley, or small, shallow dell.

Slack

The part of anything that hangs loose, having no strain upon it; as, the slack of a rope or of a sail.

Slack

Lax; not tense; not hard drawn; not firmly extended; as, a slack rope.

Slack

Weak; not holding fast; as, a slack hand.

Slack

Remiss; backward; not using due diligence or care; not earnest or eager; as, slack in duty or service.
The Lord is not slack concerning his promise, as some men count slackness.

Slack

Not violent, rapid, or pressing; slow; moderate; easy; as, business is slack.
C sar . . . about sunset, hoisting sail with a slack southwest, at midnight was becalmed.

Slack

Slackly; as, slack dried hops.

Slack

To become slack; to be made less tense, firm, or rigid; to decrease in tension; as, a wet cord slackens in dry weather.

Slack

To be remiss or backward; to be negligent.

Slack

To lose cohesion or solidity by a chemical combination with water; to slake; as, lime slacks.

Slack

To abate; to become less violent.
Whence these raging firesWill slacken, if his breath stir not their flames.

Slack

To lose rapidity; to become more slow; as, a current of water slackens.

Slack

To languish; to fail; to flag.

Slack

To end; to cease; to desist; to slake.
That through your death your lineage should slack.
They will not of that firste purpose slack.

Slack

To render slack; to make less tense or firm; as, to slack a rope; to slacken a bandage.

Slack

To neglect; to be remiss in.
Slack not the pressage.

Slack

To deprive of cohesion by combining chemically with water; to slake; as, to slack lime.

Slack

To cause to become less eager; to repress; to make slow or less rapid; to retard; as, to slacken pursuit; to slacken industry.
I should be grieved, young prince, to think my presenceUnbent your thoughts, and slackened 'em to arms.
In this business of growing rich, poor men should slack their pace.
With such delayWell plased, they slack their course.

Slack

To cause to become less intense; to mitigate; to abate; to ease.
To respite, or deceive, or slack thy painOf this ill mansion.

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

Slack

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

Slack

A stretch of water without current or movement;
Suddenly they were in slack water

Slack

The condition of being loose (not taut);
He hadn't counted on the slackness of the rope

Slack

A cord or rope or cable that is hanging loosely;
He took up the slack

Slack

Avoid responsibilities and work, be idle

Slack

Be inattentive to, or neglect;
He slacks his attention

Slack

Release tension on;
Slack the rope

Slack

Make less active or fast;
He slackened his pace as he got tired
Don't relax your efforts now

Slack

Become slow or slower;
Production slowed

Slack

Make less active or intense

Slack

Become less in amount or intensity;
The storm abated
The rain let up after a few hours

Slack

Cause to heat and crumble by treatment with water;
Slack lime

Slack

Not tense or taut;
The old man's skin hung loose and gray
Slack and wrinkled skin
Slack sails
A slack rope

Slack

Lacking in strength or firmness or resilience;
Flaccid muscles
Took his lax hand in hers
Gave a limp handshake
A limp gesture as if waving away all desire to know
A slack grip

Slack

Flowing with little speed as e.g. at the turning of the tide;
Slack water

Slack

Lacking in rigor or strictness;
Such lax and slipshod ways are no longer acceptable
Lax in attending classes
Slack in maintaining discipline

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