Antonyms for the word "in-sufficiencies" are abundance, excess, plenty, surplus, and sufficiency. Abundance refers to having a large quantity of something. Excess implies something beyond what is necessary, while plenty suggests ample or more than enough. Surplus means an excess amount over what is needed. Sufficiency refers to having as much as needed to meet the requirements. These antonyms are useful when we want to describe the opposite of insufficiency, which means something is lacking or deficient in quantity, quality, or adequacy. By using antonyms, we can paint a picture of a situation that is thriving or prosperous.