From The Collaborative International Dictionary of English v.0.48 [gcide]:
Impossible \Im*pos"si*ble\, a. [F., fr. L. impossibilis; pref.
im- not + possibilis possible. See Possible.]
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.
[1913 Webster]
With men this is impossible; but with God all things
are possible. --Matt. xix.
26.
[1913 Webster]
Without faith it is impossible to please him. --Heb.
xi. 6.
[1913 Webster]
Impossible quantity (Math.), an imaginary quantity. See
Imaginary.
Syn: See Impracticable.
[1913 Webster]