The prefix "super-" means "above," "beyond," or "excellent." There are several antonyms for this prefix, and they are prefixes that have negative, opposite, or lesser meanings. One antonym is "sub-," which means "under," "below," or "less than." Another antonym is "infra-," which means "lower," "beneath," or "less important." "Un-" is also an antonym, and it means "not" or "lacking." Lastly, "non-" is an antonym that indicates "not," "absence," or "opposite." It is useful to be aware of the antonyms of prefixes, especially in building vocabulary, because it enhances their understanding of words and their meanings.