The word "unfeasibility" refers to something that is not possible or practical. Its synonyms include impracticality, impossibility, and unworkability. However, there are several antonyms for this word that describe the opposite meaning. These include feasibility, workability, practicality, possibility, and achievability. These antonyms suggest that something is possible, attainable, or realistic. In other words, if a project or idea is deemed feasible, it means it is likely to happen or be successful. Therefore, the antonyms for unfeasibility provide a sense of optimism and hopefulness that something can be achieved despite initial setbacks or challenges.