lack

American  

[lak] / læk /

noun

1. an absence or inadequate amount of something needed, desirable, or customary.

   We had to severely limit our holiday gift shopping due to lack of funds.

   Lack of skill is the main reason he didn’t get the job.

   Synonyms:

   need, want, insufficiency, deficit, paucity, scarcity, dearth

   Antonyms:

   surplus

2. something missing or needed.

   After he left, they really felt the lack.

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verb (used with object)

1. to be without or deficient in.

   She wants to become an actor, but unfortunately she lacks ability.

   Many of the villagers lacked even the basic necessities of life.

   Synonyms:

   need, want

2. to fall short of a target or requirement by (a particular amount).

   He lacks three votes to win.

verb (used without object)

1. to be absent or missing, as something needed or desirable.

   Three votes are lacking to make a majority.

verb phrase

1. lack in to be short of or deficient in.

   What he lacks in brains, he makes up for in brawn.

lack British  

/ læk /

noun

1. an insufficiency, shortage, or absence of something required or desired

2. something that is required but is absent or in short supply

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verb

1. to be deficient (in) or have need (of)

   to lack purpose

Usage

What are other ways to say lack? To lack something is to be without or deficient in it. How does lack compare to synonyms want, need, and require? Find out on Thesaurus.com. 

Etymology

Origin of lack

First recorded in 1125–75; Middle English lak; cognate with Middle Low German lak, Middle Dutch lac “deficiency”; akin to Old Norse lakr “deficient”

Explanation

If you lack something, you need or want something that's missing. When there's a lack of food, people starve. There are a lot of things lacking in the world. If you have no video games, then you're lacking them. People who are thirsty and starving lack food and water. Many people lack money and health care. A lack of something is the opposite of an abundance of something. If you have plenty of books, then you don't lack them — though you may lack enough time to read them all.

Example Sentences

Lack of affordable fertilizer could lead to lower crop yields, food production, and profits for farmers, writes OA senior analyst Sarah Fowler.

From Barron's • Mar. 29, 2026

Their findings, published in Nature Communications, come from a study titled "Lack of Caspase 8 Directs Neuronal Progenitor-like reprogramming and Small Cell Lung Cancer Progression."

From Science Daily • Mar. 25, 2026

Markets are not paying enough attention to natural gas and LNG, said Simon Lack, a portfolio manager of Catalyst Funds.

From MarketWatch • Mar. 2, 2026

Lack of imagination to come up with activities that make the most of my retirement years?

From The Wall Street Journal • Nov. 18, 2025

Lack of soap and water and toilet facilities weren’t the only problems that the Soviet soldiers faced in terms of hygiene.

From "A Thousand Sisters" by Elizabeth Wein

Related Words

• absence
• dearth
• inadequacy
• loss
• paucity
• poverty
• reduction
• scarcity
• shortage
• shortcoming
• shortfall