impossible
1. [ adjective ] not capable of occurring or being accomplished or dealt with
Examples:

"an impossible dream" "an impossible situation"

Related terms: possible unachievable out hopeless impracticable hopeless impractical unrealistic insurmountable unthinkable possibility
2. [ adjective ] totally unlikely
Synonyms: out_of_the_question unimaginable inconceivable
Related terms: unthinkable
3. [ noun ] (psychology) something that cannot be done
Examples:

"his assignment verged on the impossible"

Related terms: impossibility
4. [ adjective ] used of persons or their behavior
Synonyms: unacceptable unsufferable insufferable
Examples:

"impossible behavior" "insufferable insolence"

Related terms: intolerable
Similar spelling:   impossibly
  impassable
  impossibility
  imposingly
  imposing
  imposed
  impasse
  imposter
  imposture
  imposition
  impassive