The antonyms for the term 'feasibility study' could vary depending upon the context of the word. Generally, antonyms for feasibility study are terms such as impracticality, unfeasibility, impossibility, and unworkability. A feasibility study is a crucial process to determine the practicality and viability of a project. Therefore, antonyms signify the nonexistence of possibilities or inability to accomplish the given task either due to lack of resources or the complexity of the project. Antonyms such as absurdity, infeasibility, or irrationality evoke negative connotations highlighting the frivolous, unrealistic, or illogical nature of the concept, suggesting it to be a lost cause.