@blacksoulgem95 another fun one: "capital" and "terminal" are both synonyms (deadly) and antonyms (first vs last)
@andri @technomancy @blacksoulgem95
etymonline.com provides some historical explanation for at least some of them
Another interesting example is "before" which means "earlier in time" as well as "in front".
Similarly there are false friends between related languages that mean their opposites (e.g. zapomnieć means "to forget" in Polish, whereas запомнить means "to remember" in Russian).