Efficacious

usgb/ˌefɪˈkeɪʃəs/
adjective

Able to produce the desired result or effect.

The vaccine has proven to be efficacious in preventing illness.
Visual representation of "efficacious" - Able to produce the desired result or effect

Often appears as...

  • efficacious treatment
  • efficacious solution

Usage tips

Formal

Definition 1 of 2
Visual representation of "efficacious"
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Result-Oriented

Efficacious suggests a practical, positive outcome; it emphasizes on achieving goals.

Illustration for Result-Oriented
Her study method was efficacious for learning new languages quickly.
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Not Automatic

Efficacious doesn’t mean instant success, it implies effectiveness through effort or design.

Illustration for Not Automatic
Regular exercise is efficacious for maintaining good health.
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Positive Connotation

Unlike 'effective', which is neutral, 'efficacious' often has a positive tone.

Illustration for Positive Connotation
The new teaching strategy was more than effective; it was efficacious.
Visual representation of the word "Efficacious"

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