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There was a related thread way back here: http://www.waywordradio.org/discussion/topics/up-or-down/
Ran into this page on Mental Floss today: http://mentalfloss.com/article/57032/25-words-are-their-own-opposites
There’s a few words on this list for which the opposite meaning seems a bit obscure, but was an interesting read and I thought I’d share it.
One fact mentioned on that page is that there are several synonyms for “contronym.” Copied and pasted:
The contronym (also spelled “contranym”) goes by many names, including “auto-antonym,” “antagonym,” “enantiodrome,” “self-antonym,” “antilogy” and “Janus word” (from the Roman god of beginnings and endings, often depicted with two faces looking in opposite directions).
No real question here. Just your daily dose of word trivia. Enjoy.