You searched for: “most efficacious”
efficacious (adjective), more efficacious, most efficacious
A reference of something which is capable of producing a desired effect or result: The medicine that the doctor prescribed was supposed to have an efficacious healing of Sam's painful throat.

The politician was rewarded for her efficacious efforts by being elected as governor again.

Pertaining to the power to produce an intended effect.
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This entry is located in the following units: -acious (page 1) fac-, facil-, fact-, feas-, -feat, -fect, -feit, -facient, -faction, -fic-, -fy, -ficate, -fication (page 10) -ous, -ious, -eous (page 8)