Impossible

Part of speech: noun (n.)

An impossibility. [Obs.] "Madam," quoth he, "this were an impossible!" Chaucer.

Part of speech: adjective (a.)

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. 6. Impossible quantity (Math.), an imagnary quantity. See Imaginary.

Synonyms: See Impracticable.