insufficient
Americanadjective
-
not sufficient; lacking in what is necessary or required.
an insufficient answer.
- Synonyms:
- deficient, scanty, inadequate
-
deficient in force, quality, or amount; inadequate.
insufficient protection.
adjective
Other Word Forms
Etymology
Origin of insufficient
First recorded in 1350–1400; Middle English, from Late Latin insufficient-, stem of insufficiēns; equivalent to in- 3 + sufficient
Explanation
If something is insufficient, it isn't enough. A high school diploma is very helpful for getting a job, but by itself, it's probably insufficient to land you a job as an astronaut. Something adequate is sufficient, and something inadequate is insufficient (in- meaning "not"). If you have $100 in the bank and you try to use a debit card for a $102 purchase, even though you’re close to having enough, your funds are insufficient to cover the sale. Anything that falls short of a required amount or expected measure is insufficient, whether it's the amount of air in a bike tire or the votes needed to win an election.
Vocabulary lists containing insufficient
Figurative Language in King's "I Have a Dream" Speech (1963)
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Martin Luther King Jr.'s "I Have a Dream" Speech (1963)
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Bridge to Terabithia
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Abbott has tried to ameliorate these concerns by requiring all new data centers to be audited by the state, a step that policy experts and Democrats have criticized as insufficient.
From Salon ● Sep. 18, 2026
"People may revert to their prior behavioural patterns because the incentive payments are insufficient when the enthusiasm has waned," said Ferraro, an expert in human behaviour and public policy.
From Barron's ● Sep. 17, 2026
“In light of evolving societal norms, the Commissioner deems there is insufficient justification for the continued use of marital status in automobile insurance rating,” the filing stated.
From Los Angeles Times ● Sep. 16, 2026
Markets could effectively be saying that one rate increase is insufficient to contain the inflation problem or that investors require greater compensation for risks extending beyond monetary policy.
From MarketWatch ● Sep. 15, 2026
The kilns in the neighbouring villages were kept busy firing the bricks, but their output was insufficient, and the carts had to go farther afield, returning dusty and brick-filled.
From "Nectar in a Sieve" by Kamala Markandaya
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
