efficacy
noun (formal)

- the ability to produce a desired or intended result

Oxford Languages
 
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WORD ORIGIN


“Efficacy” (the quality of being effectual, producing the desired effect”) is from the 1520s, from Latin efficacia and efficax, meaning "powerful, effectual, efficient”.

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EFFICACY QUOTES
Choose your favourite:

- "Efficiency is doing things right; effectiveness is doing the right things." (Peter Drucker)

- "Efficiency is doing better what is already being done." (Peter Drucker)

- "If you find yourself in a hole, stop digging." (Will Rogers)

- "The best way to get something done is to begin." (Unknown)

- "You can do anything, but not everything." (David Allen)

- "The only way to achieve the impossible is to believe it is possible." (Charles Kingsleigh in ‘Alice in Wonderland’)

- "The best time to plant a tree was 20 years ago. The second-best time is now." (Chinese Proverb)

- "If at first, you don't succeed, skydiving is not for you." (Steven Wright)

- "The road to success is always under construction." (Lily Tomlin)

- "The trouble with the rat race is that even if you win, you're still a rat." (Lily Tomlin)

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SYNONYMS

ability, adeptness, adroitness, agility, alacrity, aptitude, aptness, artfulness, astuteness, a well-oiled machine, brilliance, capability, cleverness, clockwork precision, competence, cool, craft, craftiness, cunning, dash, deftness, dexterity, dexterousness, effectiveness, EFFICACY, effortlessness, élan, expertise, facility, finesse, flair, grace, handiness, knack, know-how, lightning in a bottle, like butter, mastery, panache, poetry in motion, polish, proficiency, prowess, shine, silk-like proficiency, skill, skillfulness, slickness, smartness, snap, sophistication, touch, versatility, wallop, zing, zip, zippiness

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SMUGGLE OWAD into an English conversation, say something like:

“In an attempt to increase office efficiency, they installed a "motivational" poster that left everyone questioning its EFFICACY and their sanity.”

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