As a former IELTS and CAE examiner, I just want to say that your version would gain a higher mark in those examinations than Mnemon's highfalutin version.
That's not an accurate statement, particularly when it comes to GRE. I've never been an IELTS examiner, but I've been told different.
I've come here for a reason and the reason is to ameliorate improve my proficiency in English.
Our aim is to help you improve your use of English. If we point out that you've used certain vocab items inaccurately, you'd do very well to take notice.
If that's how you want to help me (and others) improve our use of English, then you'll fail pretty dismally. Shall we say "dismally" or "abysmally" in this case, Jutfrank?
"Ameliorate" in the above quote may be seen as
formal,
pompous,
highfalutin,
turgid,
turbid or even
antediluvian, but it's 100% accurate.
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Those screenshots have been taken from the book,
Essential Words for the GRE.