What does lack mean?
Lack is a common English word used for both a noun and a verb. As a noun, it describes the absence or insufficiency of something required, as in “a lack of evidence” or “a lack of confidence.” As a verb, it describes something that is missing a necessary quality, resource, or feature: “The proposal lacks detail.” The word is widely used in formal and informal contexts, although constructions such as “lack of” are especially common in official reports, academic writing, and journalism. It can refer to a serious shortage, as with food or funding, or to a smaller deficiency, as with confidence or clarity. Because lack is direct and broadly understood, it is useful when discussing what is missing, inadequate, or preventing an activity from proceeding.
The absence or deficiency of something needed, wanted, or expected.
"The town's growth was limited by a lack of affordable housing."
Usually used with “of”: “a lack of money,” “a lack of access.”
To be without something, or to fail to possess a required quality, feature, or resource.
"The new policy lacks the safeguards needed to protect private data."
Common in formal and professional contexts and frequently followed by a direct object.
The plural is uncommon; “lacks” may appear in technical or formal contexts, while singular constructions are preferred.
"The report identifies several lacks in the current review process."
A lack is often more noticeable than an abundance: one missing ingredient can change the whole result.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of lack
The modern English word descends from Middle English “lac,” a noun meaning absence or deficiency. The word's ultimate origin is uncertain, and its development as a verb meaning to be without something is recorded in English from the Middle English period. It is unrelated to the modern adjective “lax,” although the two words can be confused in speech and spelling.
Related word forms
How lack is actually used
As a noun, lack is commonly followed by “of” and a noun: “a lack of time.” As a verb, it usually takes a direct object: “The design lacks detail.”
Easily confused with lack
Lack means an absence or deficiency, whereas lax means insufficiently strict or careful.