The antonyms of the word "buying sell" are "not buying" and "not selling." These two phrases connote a lack of transaction or exchange of goods and services between two parties. When someone is not buying, it could mean that they have already acquired the item they want or are not interested in purchasing at the moment. Similarly, when someone is not selling, it could mean that they do not have something to offer or do not see a need to dispose of their goods or services. Antonyms are essential in language because they allow us to express different nuances and shades of meaning, which makes communication more accurate and effective.