The phrase "not in sufficient quantity" can be replaced with other words to express the same idea. Some synonyms for this phrase include inadequate, insufficient, deficient, scarce, inadequate, meager, paltry, limited, destitute, and sparse. These words describe a lack of something, whether it is a physical item or a resource like time or money. When speaking or writing, using synonyms adds variety and helps to avoid repetition, making the message more interesting and engaging. Alternatively, the use of synonyms also provides specificity when discussing quantities, making it easier to convey how much of something is missing or lacking.