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not effective

ADJECTIVE

ineffective

Synonyms

STRONGEST

feeble fruitless futile impotent inadequate incompetent indecisive ineffectual inefficient inept limited null powerless unable unproductive unprofitable unsuccessful worthless

WEAK

abortive anticlimactic barren bootless defeasible emasculate epicene feckless forceless idle inefficacious inferior innocuous inoperative lame neutralized no-go nugatory paltry slack-spined spineless unavailable unavailing unfruitful vain void withered

Antonyms

STRONGEST

able adequate capable competent dexterous effective effectual efficient expert fit fruitful potent powerful productive profitable skillful strong successful sufficient useful valuable worthwhile worthy

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.

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not effective

“She was not effective at turning priorities into results, working through disagreements and staying with the job when things didn’t go her way,” said Jonasson.

From Los Angeles Times ● Oct. 22, 2026

Two former employees also testified that Take a Break and Quiet Mode were not effective.

From Barron's ● Aug. 25, 2026

That’s not effective fraud protection — that’s a broken system that is wasting money and creating friction with customers and vendors.

From MarketWatch ● Apr. 22, 2026

It also opens the possibility that treating hypercortisolism could provide a new way to lower blood pressure when standard therapies are not effective.

From Science Daily ● Mar. 30, 2026

“Or it’s not effective on egglets,” Jordie puts in.

From "Linked" by Gordon Korman

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