/ ɪmˈpɒsəbl; NAmE -ˈpɑːs-/ adjective
1.
that cannot exist or be done; not possible :
almost / virtually impossible
It's impossible for me to be there before eight.
It's impossible to prove.
I find it impossible to lie to her.
an impossible dream / goal
OPP possible
2.
very difficult to deal with :
I've been placed in an impossible position .
Honestly, you're impossible at times!
3.
the impossible noun [ sing. ] a thing that is or seems impossible :
to attempt the impossible
► im·pos·si·bil·ity / ɪmˌpɒsəˈbɪləti; NAmE -ˌpɑːsə-/ noun [ U , C , usually sing. ] ( pl. -ies ):
the sheer impossibility of providing enough food for everyone
a virtual impossibility
► im·pos·sibly / ɪmˈpɒsəbli; NAmE -ˈpɑːs-/ adverb :
an impossibly difficult problem (= impossible to solve)
He was impossibly handsome (= it was difficult to believe that he could be so handsome ) .
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WORD ORIGIN
Middle English : from Old French , or from Latin impossibilis , from in- not + possibilis , from posse be able.