For example, “flammable” and “inflammable” both describe an object that can easily catch on fire. I can also think of “ceased” and “deceased”, both of which can mean someone or something has been brought to an end.
edit: Some people are including words that can also mean its opposite (like sanction or table), those are cool too! The more weird words, the better!
To bone and to debone both mean to remove bones from something, typically food.
Similarly, peel and unpeel.
Hulled means either the hull is still present or has been removed.
Unpitted DO have pits, and pitted have NO pits.
Sounds so backwards. The problem is they’re referring to the verb of the word “pit”, meaning “removing the pit”. So “unpitted” means “not removing the pit”. So dumb.
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One of those also means to add a bone to something. Coincidentally, that’s why I got fired from my job at the butcher shop.