efficacious

adj.
Producing or capable of producing a desired effect. See synonyms at effective.

[From Latin efficāx, efficāc-, from efficere, to effect. See effect.]

efficaciously ef'fi·ca'cious·ly adv.
efficaciousness ef'fi·ca'cious·ness n.

adjective

Producing or able to produce a desired effect: effective, effectual, efficient, productive. See thrive/fail/exist.

adj

Definition: efficient, productive
Antonyms: incapable, inefficacious, inefficient, unproductive, unsuccessful, useless

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Note: click on a word meaning below to see its connections and related words.

The adjective has 2 meanings:

Meaning #1: marked by qualities giving the power to produce an intended effect
  Antonym: inefficacious (meaning #1)

Meaning #2: producing or capable of producing an intended result or having a striking effect
  Synonyms: effective, effectual

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Dansk (Danish)
adj. - virkningsfuld

Nederlands (Dutch)
doeltreffend

Français (French)
adj. - efficace, opérant (une mesure, une méthode)

Deutsch (German)
adj. - wirksam

Ελληνική (Greek)
adj. - δραστικός, αποτελεσματικός

Italiano (Italian)
efficace

Português (Portuguese)
adj. - eficaz

Русский (Russian)
эффективный, действенный

Español (Spanish)
adj. - eficaz

Svenska (Swedish)
adj. - verksam

中文（简体）(Chinese (Simplified))
有效的, 灵验的

中文（繁體）(Chinese (Traditional))
adj. - 有效的, 靈驗的

한국어 (Korean)
adj. - 효과 있는

日本語 (Japanese)
adj. - 効き目のある

العربيه (Arabic)
‏(صفه) فعال, مؤثر‏

עברית (Hebrew)
adj. - ‮יעיל, אפקטיבי, מביא לתוצאות, מסוגל ליצור את האפקט המבוקש‬

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