Teeny weeny is a phrase used to describe something small in size. Antonyms for teeny weeny could be big, enormous, vast, or colossal. These words denote huge sizes and can be used to describe something that is the opposite of small. Other antonyms for teeny weeny may include substantial, significant, considerable, or ample which suggest something's mass or volume is not trivial. Conversely, words like minuscule, microscopic, puny, or tiny can be considered synonyms of teeny weeny as they also characterize something little in size. Selecting the appropriate term depends on the context and convey the intended meaning clearly.