When something is "not workable," it's an indication that it isn't practical, feasible, or effective. Finding synonyms for this phrase can help you express the same idea in different ways. Some possible alternatives include "unfeasible," "impractical," "non-viable," "untenable," "unworkable," "unrealistic," "unattainable," "unachievable," "undoable," "ineffective," "impossible," "unproductive," and "useless." Each of these words captures a slightly different nuance of the concept of something that can't be made to work, whether due to inherent flaws, a lack of resources or support, or some other insurmountable obstacle. Choosing the right synonym can help strengthen your writing and get your point across more effectively.