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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 results of a project carried out in Nice and along the French Riviera show why anticipation and preventive evacuation measures remain the only truly effective means of saving lives.

From Science Daily • May 21, 2026

Genetic risk can be detected, but there’s no effective treatment or cure.

From Barron's • May 21, 2026

Eli Lilly’s next-generation weekly weight-loss shot may be more effective than Zepbound or bariatric surgery, which has long been the gold standard for weight loss.

From MarketWatch • May 21, 2026

Amgen has said avacopan is an important and effective medicine that treats a rare and life-threatening disease, for which patients have few other options.

From The Wall Street Journal • May 21, 2026

Even if they had, there was no effective treatment on offer.

From "The Woman All Spies Fear" by Amy Butler Greenfield




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