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Definitions

effective

[ih-fek-tiv, ee-fek‐] / ɪˈfɛk tɪv, iˈfɛk‐ /
ADJECTIVE
successful, persuasive
Synonyms
STRONGEST
active adequate compelling competent direct efficient forceful impressive potent powerful practical successful useful valid
STRONG
effectual efficacious
WEAK
able big-wheel capable cogent convincing emphatic energetic forcible having lead in pencil live moving on the ball operative persuasive playing hardball powerhouse producing resultant serviceable serving sound striking telling trenchant virtuous wicked yielding
Antonyms
STRONGEST
helpless impotent inadequate incapable incompetent ineffective inefficient insufficient unable useless weak worthless
STRONG
unproductive unsuccessful
WEAK
fruitless inoperative
ADJECTIVE
in use at the time
Synonyms
STRONGEST
active direct dynamic
WEAK
actual current in effect in execution in force in operation operative real
Antonyms
STRONGEST
inactive
WEAK
fruitless impotent incapable ineffective inoperative unproductive useless weak

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.

It slightly increased the rate of appreciation of the Singapore dollar’s nominal effective exchange rate policy band, aiming to curb rising prices.

From The Wall Street Journal • Apr. 14, 2026

He is also accused of violating the court’s standing order, effective Jan. 28, 2025, that requires attorneys disclose any use of generative AI when submitting filings.

From Los Angeles Times • Apr. 14, 2026

Instead of focusing only on the seat, the most effective protection comes from good hygiene.

From Science Daily • Apr. 13, 2026

"Parents deserve independent confirmation that the moderation is sufficient, that help systems are effective, and that age checks aren't used for commercial profiling."

From BBC • Apr. 13, 2026

Modern trials of the efficacy of therapies depend on the idea that an effective therapy must perform better than a placebo.

From "The Invention of Science" by David Wootton

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