not capable of being carried out or put into practice; "refloating the sunken ship proved impracticable because of its fragility"; "a suggested reform that was unfeasible in the prevailing circumstances"
{s} cannot be carried out, not practicable, cannot be accomplished; impassable; cannot be put into practice, not suited for practical use; stubborn, intractable
If something such as a course of action is impracticable, it is impossible to do. Such measures would be highly impracticable and almost impossible to apply. impossible or very difficult to do for practical reasons
Not to be overcome, persuaded, or controlled by any reasonable method; unmanageable; intractable; not capable of being easily dealt with; used in a general sense, as applied to a person or thing that is difficult to control or get along with