Impossible.
ETYM French from Latin impossibilis; pref. im- not + possibilis possible. Related to Possible.
1. Not capable of occurring or being accomplished or dealt with.
2. Totally unlikely; SYN. inconceivable out of the question unimaginable.
3. Used of persons or their behavior; SYN. insufferable unacceptable unsufferable.
Not capable of being done or accomplished; impracticable.