impossible (not possible, cannot happen, or be done): It is impossible to escape this place.
unfeasible (not possible to do or achieve): The lack of money made it unfeasible to continue with the project.
out of the question (not possible and therefore not worth discussing): Going out in this stormy weather is out of the question.
impracticable (not possible or very difficult to do): It is a nice idea but quite impracticable.
there’s no way informal (there is no possibility): There’s no way I can finish this on time.
unattainable (not possible to achieve): This is an unattainable goal.
unthinkable (not possible to imagine or believe): This place without you is unthinkable.
