"Tom Thumbs" is a catch-all term used to describe things that are small or minuscule. When it comes to finding antonyms for this term, there are plenty of options to choose from. Some excellent opposites of Tom Thumbs include "enormous," "gigantic," "colossal," "massive," and "titanic." These terms describe something that is large, bulky, or extremely significant in size. Other great antonyms for Tom Thumbs include "grandiose," "imperious," imposing," "arrogant," and "preposterous." These words describe something that is grand or imposing in its demeanor, attitude, or appearance. Regardless of the context, these antonyms can be used to create strong writing and express ideas with clarity and power.