Longman Dictionary of Contemporary English - impossible

~ adj 1 »CAN'T BE DONE« something that is impossible cannot happen or be done  (Further research is impossible without more money. | This crossword's absolutely impossible! | Impossible! It can't be true. | find it impossible to do sth)  (Members with young children often found it impossible to attend evening meetings. | ask the impossible (=ask for something that cannot be done))  (Expecting the project to be completed by October was really asking the impossible. | do the impossible (=succeed in doing something that seems impossible))  (Somehow, Jen had done the impossible and got us all tickets. | impossible demands/requests etc (=demands etc for something that is impossible)) 2 »SITUATION« a situation that is impossible is extremely difficult to deal with  (Helen's refusal to cooperate has put me in an impossible position. | His bad temper is making life impossible for the rest of the family.) 3 »PERSON« someone who is impossible behaves in a very unreasonable and annoying way  (You're impossible! Yesterday you said you didn't like carrots, and today you won't eat potatoes!) - impossibly adv  (impossibly difficult) - impossibility n  (To walk there would have been a virtual impossibility.)