impossible

sifat adjective

1. Not possible; not able to be done or happen. It is difficult, if not impossible, to memorize 20,000 consecutive numbers.
2. (of a person) Very difficult to deal with. You never listen to a word I say – you're impossible!
3. Imaginary impossible quantities, or imaginary numbers

ot noun

1. An impossibility Late 14th century: “Madame,” quod he, “this were an impossible!” — Geoffrey Chaucer, ‘The Franklin's Tale’, Canterbury Tales