The term "more itty bitty" refers to something that is even smaller or more minuscule than an already tiny object. Antonyms for this term include words like big, large, substantial, and significant. These words convey the opposite meaning of something that is of considerable size, weight, or worth. A few other antonyms for "more itty bitty" could be phrases such as "hefty," "substantial," "considerable," and "ample." These words are often used to describe things that are important, substantial, and worthy of attention, whereas "itty bitty" is used to describe something that is minuscule and often overlooked.