The term "most a-ok" is an expression that means something is going well or is satisfactory. The antonyms of this phrase include words such as unpleasant, unsatisfactory, unacceptable, and unsuitable. When something is unpleasant, it means that it is not enjoyable or pleasing. Unsatisfactory means that something is below the expected standards or not meeting the requirements. Unacceptable, on the other hand, signifies something that is not acceptable or not fit for a particular purpose. Lastly, unsuitable suggests that something is not appropriate or is not well-suited to a particular situation. In contrast to "most a-ok", these words connote a negative or unfavorable connotation.