The antonyms of "over runnings" are underutilized, minimal, scarce, deficient, insufficient, lacking, and inadequate. "Over runnings" means having more than necessary or exceeding the limit, whereas, its antonyms are quite opposite to its meaning. These antonyms relate to everything that is less than sufficient, inadequate or scarce. Underutilized means inefficient use or not being used to its full capacity. Minimal means something that is barely sufficient or the least amount needed. Scarce, deficient, insufficient, and lacking suggests that something is not enough or there is a shortage. Therefore, while "over runnings" refers to excessive amounts, its antonyms refer to inadequate or insufficient quantities.