Being numerous refers to a large quantity or abundance of something. However, there are a variety of antonyms or opposite words that can be used to describe the opposite of being numerous. A few examples include being few, scarce, rare, or limited. These terms describe a small quantity or scarcity of something, highlighting the opposite of an abundance or large quantity. Additionally, terms like singular or unique can be used to describe something that is the only one of its kind, further emphasizing the opposite of being numerous. Understanding antonyms and their meanings can help to broaden vocabulary and improve communication skills.