An impossibility. 'Madam, quoth he, this were an impossible!' (Chaucer)
Not possible; incapable of being done, of existing, etc.; unattainable in the nature of things, or by means at command; insuperably difficult under the circumstances; absurd or impracticable; not feasible. With men this is impossible; but with god all things are possible. (Matt. Xix. 26) Without faith it is impossible to please him. (Heb. Xi.
Synonym: see impracticable.