Not possible; not able to be done or happen. / (colloquial, of a person) Very difficult to deal with. / (mathematics, dated) imaginary

An impossibility. / A skateboard trick consisting of a backflip performed in midair.

plural of impossible

Quality of being impossible.

Something that is impossible. / (uncountable) The quality of being impossible. / (obsolete) The state of being unable to do something.

Not possibly; in an impossible manner. / To the point of impossibility. / Contrary to what had been thought possible.

plural of impossibility

(figuratively) A belief or goal which is unattainable despite the pursuer's high hopes.

An extremely difficult, if not impossible, task.

plural of impossible bottle