Definitions

insufficient

[in-suh-fish-uhnt] / ˌɪn səˈfɪʃ ənt /

ADJECTIVE

not enough; lacking

Synonyms

STRONGEST

deficient faulty inadequate incomplete meager poor scant scarce unsatisfactory

WEAK

bereft defective destitute devoid drained dry failing imperfect incapable incommensurate incompetent infrequent minus out of rare short short of shy thin too little too late unample unfinished unfitted unqualified wanting

Antonyms

STRONGEST

adequate enough perfect satisfactory strong sufficient

WEAK

ample

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.

Supplements may be useful when dietary intake is insufficient or osteoporosis is present, but excessive intake should be avoided.

From Science Daily • Jun. 6, 2026

Sheinbaum’s government has said the evidence supporting Rocha’s arrest and extradition is insufficient.

From The Wall Street Journal • Jun. 6, 2026

"It didn't limit student use of AI in any way -- so, completely insufficient, inadequate."

From Barron's • Jun. 5, 2026

There is insufficient evidence to suggest a social media ban for under‑16s would help keep children safer online, Scotland's children's commissioner has said.

From BBC • May 29, 2026

I have to make amends for being insufficient.

From "The Girl on the Train" by Paula Hawkins

Vocabulary lists containing insufficient

Figurative Language in King's "I Have a Dream" Speech (1963)

Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!

Martin Luther King Jr.'s "I Have a Dream" Speech (1963)

Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!

Bridge to Terabithia

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!