What IS a reprobate?!

What is a “reprobate(s)”, how many times does this word(s) occur in the various Bible “versions”, and what does it actually mean?
“And account that the longsuffering of our Lord is salvation; even as our beloved brother Paul also according to the wisdom given unto him hath written unto you; As also in all his epistles, speaking in them of these things; in which are some things hard to be understood, which they that are unlearned and unstable wrest, as they do also the other scriptures, unto their own destruction.” (2 Peter 3:15 to 16)
https://www.azquotes.com/quote/602950
https://webstersdictionary1828.com/Dictionary/Reprobate
https://www.e-sword.net/
https://www.purebiblesearch.com/
https://www.jw.org/en/library/bible/study-bible/books/
https://www.azquotes.com/quote/856730
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