The phrase "be sufficient" means to be adequate or enough in quantity or quality. There are several synonyms for this phrase including: be enough, meet requirements, satisfy, fulfill, meet the standard, be adequate, be satisfactory, be competent, be equal to the task, and be up to par. These synonyms all refer to the idea that something is just the right amount or quality that is needed for a particular situation or purpose. Whether you use "be sufficient" or one of its synonyms, the idea is to convey that something is just right and meets the necessary criteria.