Differences in uses of efficient and effective [duplicate]

I am really confused when efficient and effective appear in a sentence. I get quite confused about the whole meaning of the sense it pulls of.

2025 Nov 20

synonyms

According to OED: diffident: modest or shy because of a lack of self-confidence: a diffident youth. Another word as @Jim suggested would be timid. timid: showing a lack of

2025 Sep 11

etymology

5 My friend in the industry wrote up a little explanation for me to share: The readout is essentially when the results of a clinical trial are made public. It can take a long time

2024 Mar 16

Is there any difference in meaning between ''efficacy'' and

Agreed - Efficacy is about the results, whereas Efficiency is about waste when achieving the results. Something could be said to have good efficacy but poor efficiency, if it

2025 Jan 28

prepositions

Any subtle difference concerning the viability and efficacy of criticism, according to the preposition used? The Ngram shows that "immune against" has always been unusual.

2024 Oct 26

single word requests

The word efficacy is often used in the medical field. For example, a paper might be on the efficacy of a treatment or a particular drug. The word, of course, implies how effectual

2025 Oct 16

What''s the difference between "efficacy" and "effectiveness"?

I usually use the word "effectiveness" in conversation, but sometimes I use the word "efficacy" then self-correct with "effectiveness" . Is there a practical difference between them?

2024 Sep 16

nouns

Efficacy is a perfect word for this use and is usually used in the context of drug function when discussing how good a particular substance is at achieving a goal.

2025 Apr 16

"available (availability)" vs. "valid (validity)" for "having

Having sufficient power or efficacy; valid. valid sound; just; well-founded: a valid reason. producing the desired result; effective: a valid antidote for gloom. having force, weight,

2025 Sep 04

Is ''efficate'' a word in English? [closed]

I routinely hear the word "efficate" being used. For example, "The most powerful way to efficate a change in the system is to participate." I do not find entries for this word in

2024 Jun 07

View/Download Efficacy of local energy storage batteries in Tehran [PDF]

PDF version includes complete article with source references. Suitable for printing and offline reading.