Most behemothic means the biggest or largest. However, there are a variety of antonyms that can be used to describe the opposite of this word. Some of these antonyms include tiny, small, miniature, petite, and little, all of which are synonyms for small or diminutive. Other possible antonyms for most behemothic include minuscule, microscopic, and infinitesimal, which all suggest something that is extremely small or barely noticeable. Additionally, some antonyms for most behemothic may refer to specific physical dimensions, such as flat or narrow, or may be used to describe something that is less significant or important than other things.