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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.

The scientists hope that by using algorithms to detect patterns of disease and predict suitable medicines, effective treatments could be found in "years rather than decades".

From BBC • May 22, 2026

Now in his fourth season, it’s clear that St. Louis’s tactics are just as effective.

From The Wall Street Journal • May 22, 2026

It’s been almost three months since the Iran war led to the effective closure of the Strait of Hormuz.

From MarketWatch • May 22, 2026

But even after scientists identify the genes involved, turning that knowledge into effective treatments has remained extremely difficult.

From Science Daily • May 21, 2026

Thus the informal Torricellian network marks the effective beginning of the institutionalization of science, driven by the conviction that collaboration and exchange would lead to more rapid progress.

From "The Invention of Science" by David Wootton




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