Thesaurus.com
Dictionary.com
Showing results for effective. Search instead for effektivertrag.
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.

Other immunotherapy treatments are licensed, for allergens such as grass and birch pollen and house dust mites, having been determined safe and effective by the Medicines and Healthcare products Regulatory Agency.

From BBC • Apr. 23, 2026

Legal representation in housing court is the single most effective tool for preventing eviction.

From MarketWatch • Apr. 23, 2026

Edwards’s most effective attorney is the silver-tongued Camille Gravel, a longtime political fixer without a law degree.

From The Wall Street Journal • Apr. 23, 2026

Longer term, however, that strategy would have been less effective.

From Barron's • Apr. 23, 2026

Boynton and Edson, however, believed their medicinal remedies were safer and more effective.

From "Ambushed!" by Gail Jarrow

Vocabulary lists containing effective

"Diary of a Wimpy Kid" by Jeff Kinney

Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!

Hatchet

Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!

STAAR English I: The Language of the Test 1

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!