A favorite with children for over fifty years, experience the excitement with the four orphaned Alden children as they roam the countryside finding new mysteries to solve.
antonym - a word that expresses a meaning opposed to the meaning of another word, in which case the two words are antonyms of each other; to him the antonym of `gay' was `depressed'. opposite, opposite word.
The word for words that mean the opposite of each other, or nearly so, is antonym. An antonym of tall may be short, and an antonym of large can be small. Some words have very specific meanings, or more than one meaning, and may have more than one antonym.