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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.

But Institute chief executive Prof Siddarthan Chandran says it is possible that even one of them could also be effective in the brain and we just don't know it yet.

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

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

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

I bought a new shotgun, which I always kept at hand, and the Walmart in Wasilla started carrying an anti-bear spray that was very effective, which I carried in a holster on my belt.

From This Side of Wild by Gary Paulsen

Vocabulary lists containing effective

"Diary of a Wimpy Kid" by Jeff Kinney

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Hatchet

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STAAR English I: The Language of the Test 1

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