Etymology
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impossible (adj.)

late 14c., from Old French impossible (14c.), from Latin impossibilis "not possible," from assimilated form of in- "not, opposite of" (see in- (1)) + possibilis (see possible). Weakened sense of "unable to be accomplished or tolerated" is from mid-19c. Related: Impossibly.

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Definitions of impossible
1
impossible (adj.)
not capable of occurring or being accomplished or dealt with;
an impossible dream
an impossible situation
impossible (adj.)
totally unlikely;
Synonyms: inconceivable / out of the question / unimaginable
impossible (adj.)
(used of persons or their behavior) not acceptable or reasonable;
impossible behavior
Synonyms: unacceptable
2
impossible (n.)
something that cannot be done;
his assignment verged on the impossible
From wordnet.princeton.edu