The phrase "bargained on" can be defined as relying upon or expecting a specific outcome or result. Its antonyms are uncertain, unpredictable, and capricious. When we "bargain on" something, we have a level of confidence that we will receive a certain outcome, which is not the case with uncertainty. Uncertainty lacks predictability or assurance, and it can be challenging to rely on something that is unpredictable. Similarly, something that is capricious is often characterized by sudden and inexplicable changes or shifts, making it nearly impossible to rely on. Therefore, we can say that antonyms for "bargained on" are uncertain, unpredictable, and capricious.