So say I looked at the thread you pointed to and put all those words in a document. If throughout my text I found a good place for them that fit contextually, you think that would be a good addition for my writing.
I agree with Teresa that the best thing is to use words you already know, because otherwise the risk of using the word incorrectly is too great.**
Having said that, I do jot down odd words I come across and I try to see if I can fit them into my work. Whether it would be a good thing for your writing though, is another question, since a great deal depends on your personal style and voice. A plain basic style might actually be harmed if a few arcane words are stuck into it at random intervals. You also need to think about your characters. For instance, I have used "egregious" more than once in my work, but almost always in the mouth of a well-educated, intelligent person. I wouldn't have it used by a village yokel.
For example to me panacea and zenith aren't oftenly used in my conversation
Nor in mine!!
To you, you said they don't necessarily impress you, so if they are used correct contextually, then you would be okay with them?
It isn't they don't impress me, it's they wouldn't faze me if I met them, provided they were used correctly.
What would be your recommendation moving forward? Double check context, and make sure the word flows and fits?
Read, read, read! And if you find a word you like and you want to use it, check and check and check. An online dictionary I use also gives examples of use, which is handy eg for recondite
http://www.collinsdictionary.com/dictionary/english/recondite?showCookiePolicy=true (But it's not infallible -- the other day I checked "patten", which is a kind of raised overshoe, and two examples were mis-spellings of "pattern" and the third a mis-spelling (?variant spelling -- it was Hilary Mantel, and I can't think she'd get it wrong) of "paten", the plate used at the Eucharist.
)
While writing this post, I remembered a clip from
Friends I saw the other day, where Joey had used a thesaurus to write a letter:
Monica: All right, what was this sentence, originally?
Joey: Oh. "They're warm, nice people with big hearts."
Chandler: And that became, "They're humid, pre-possessing homo sapiens with full-sized aortic pumps?"
** Incidentally, just to make it clear I'm no paragon of word-smithery, and it's possible to make mistakes even when you've come across a word a good deal and think you know it, I blithely used "diffident" to describe a kind of off-hand attitude displayed by someone. I can't recall now what made me check, but the dictionary definition (and I looked at several, determined to find one which agreed with me
) is shy, timid. Back to the drawing board... er... the thesaurus!