Efficacy of Micro solar Panels

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, …

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 …

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 …

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.

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?

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 …

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 …

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.

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 …

Effectually is effectively archaic. Don''t use it. Note that OP''s definitions evidence the fact that the two words are synonyms in the adverbial sense of "with efficacy", which …