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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.

That lawsuit was dismissed in June, with Liman finding the claims legally insufficient.

From Los Angeles Times • Apr. 2, 2026

All were noted as declined for insufficient evidence.

From Salon • Apr. 1, 2026

As first reported by the Mirror, the investigation which began in 2016 was dropped in 2019 after the CPS deemed there was insufficient evidence to bring charges.

From BBC • Mar. 31, 2026

Possible breaches included providing "insufficient measures to prevent new under 16 accounts being created".

From Barron's • Mar. 30, 2026

From herself to Jane—from Jane to Bingley, her thoughts were in a line which soon brought to her recollection that Mr. Darcy’s explanation there had appeared very insufficient, and she read it again.

From "Pride and Prejudice" by Jane Austen

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.