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Definitions

effective

[ih-fek-tiv, ee-fek-] / ɪˈfɛk tɪv, iˈfɛk- /




Usage

What are other ways to say effective? The adjective effective is applied to a person or a thing that has the power to, or which actually does, produce an effect: an effective boss, remedy, speech. Effectual is used especially of that which produces the effect desired or intended, or a decisive result: An effectual bombardment silenced the enemy. Efficacious suggests the capability of achieving a certain end: an efficacious plan, medicine. Efficient (applied also to persons) implies the skillful use of energy or industry to accomplish desired results with little waste of effort: efficient methods; an efficient manager. 

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.

See Examples For:

It’s unclear how effective the messaging on security has been.

From Los Angeles Times ● Nov. 14, 2026

Swarms of autonomous drones -- which "aim to neutralise an adversary through saturation" -- would be highly effective, and some states view them as a crucial strategic advantage, said Rickli.

From Barron's ● Nov. 14, 2026

Two doses of the MMR vaccine are 97% effective in preventing the disease.

From The Wall Street Journal ● Nov. 14, 2026

As a result, the mice remained less capable of launching effective immune responses when exposed to new challenges.

From Science Daily ● Nov. 13, 2026

Another especially effective strategy was disruption of the Indigenous trade networks, which caused food shortages and starvation.

From "An Indigenous People’s History of the United States" by Roxanne Dunbar-Ortiz


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