The phrase "most super-colossal" refers to something that is incredibly massive or enormous. Antonyms for this phrase could include words such as small, tiny, or minuscule. These words describe things that are on the opposite end of the size spectrum and are significantly smaller than something that is super-colossal. Other antonyms could include words like average, normal, or typical, which imply that something is not exceptionally large or impressive. While "most super-colossal" is often used in reference to physical objects, it could also refer to things like accomplishments or achievements, in which case antonyms might include words like mediocre, ordinary, or unremarkable.