Many word opposites, or antonyms, are obvious and well known, such as good and bad and black and white. Others are easy to recognize and understand because they’re formed by adding prefixes before the word, such as anti, dis, or non (approve/disapprove).
Other opposites are, frankly, mysterious. They’re “accidental lexical gaps” that aren’t formed with a prefix or suffix. Let’s look into these unpaired words that have uncommon antonyms.