If an action or event is impossible, it cannot happen or be achieved
غیرممکن، نشدنی
It was impossible to sleep because of the noise.
Oxford Essential Dictionary
impossible
adjective
If something is impossible, you cannot do it, or it cannot happen:
It's impossible for me to finish this work by five o'clock.
The house was impossible to find.
opposite possible
Longman Dictionary of Contemporary English
impossible
I. im‧pos‧si‧ble1 S2 W2 /ɪmˈpɒsəbəl, ɪmˈpɒsɪbəl $ ɪmˈpɑː-/ BrE AmE adjective
[Word Family: noun: ↑possibility ≠ ↑impossibility, the impossible, ↑possible; adverb: ↑possibly ≠ ↑impossibly; adjective: ↑possible ≠ ↑impossible]
1. something that is impossible cannot happen or be done OPP possible:
‘I want to speak to Mr Franks.’ ‘I’m afraid that’s impossible.’
It’s impossible to be accurate about these things.
The noise made sleep impossible.
Members with young children often found it impossible to attend evening meetings.
It is difficult to find work these days, but for blind people it is virtually impossible.
He was faced with a seemingly impossible task.
It was physically impossible to get the fridge through the door.
Six months ago, peace seemed an impossible dream.
Such mental attitudes are difficult, if not impossible, to change.
2. a situation that is impossible is one that you cannot deal with:
We were in an impossible situation. Whatever we decided to do would upset someone.
Helen’s refusal to cooperate put me in an impossible position.
His attitude is making life impossible for the rest of the team.
He was facing impossible odds.
3. behaving in a very unreasonable and annoying way:
Oh, you’re just impossible!
Cambridge Advanced Learner's Dictionary
impossible / ɪmˈpɒs.ɪ.bl̩ / / -ˈpɑː.sə- / adjective
B1 If an action or event is impossible, it cannot happen or be achieved:
It was impossible to sleep because of the noise.
It seems impossible that I could have walked by without noticing her.
He made it impossible for me to say no.
She ate three plates of spaghetti and a dessert? That's impossible. I don't believe it!
C2 describes a situation that is extremely difficult to deal with or solve:
It's an impossible situation - she's got to leave him but she can't bear losing her children.
C2 describes a person who behaves very badly or is extremely difficult to deal with:
I had to leave the job because my boss was impossible.
My niece is impossible when she's tired - you can't do anything to please her.
impossibility / ɪmˌpɒs.ɪˈbɪl.ɪ.ti / / -ˌpɑː.səˈbɪl.ə.t̬i / noun [ C or U ]
C2
What you're asking just can't be done - it's an impossibility.
Collins Advanced Learner’s English Dictionary
impossible
[ɪmpɒ̱sɪb(ə)l]
1) ADJ-GRADED: oft it v-link ADJ to-inf/that, ADJ to-inf Something that is impossible cannot be done or cannot happen.
It was impossible for anyone to get in because no one knew the password...
He thinks the tax is impossible to administer...
You shouldn't promise what's impossible...
Keller is good at describing music - an almost impossible task to do well.
Syn:
impracticable
Ant:
possible
Derived words:
impossibly ADV ADV adj Mathematical physics is an almost impossibly difficult subject.
impossibility [ɪmpɒ̱sɪbɪ̱lɪti] plural N-VAR oft the N of n ...the impossibility of knowing absolute truth.
N-SING: the N
The impossible is something which is impossible. They were expected to do the impossible... No one can achieve the impossible.
2) ADJ: ADJ n An impossible situation or an impossible position is one that is very difficult to deal with.
The Government was now in an almost impossible position.
Syn:
hopeless
3) ADJ-GRADED (disapproval) If you describe someone as impossible, you are annoyed that their bad behaviour or strong views make them difficult to deal with.
The woman is impossible, thought Frannie.
Syn:
intolerable
Merriam-Webster's Advanced Learner's Dictionary
impossible
im·pos·si·ble /ɪmˈpɑːsəbəl/ adj
1 a : unable to be done or to happen : not possible
• It's impossible to predict the future.
• The heavy rain made it impossible to see the road.
• It's logically/mathematically impossible.
• It's physically impossible for a child to lift that much at once.
• It's virtually/nearly/almost impossible to book a flight just before the holiday.
• I find it impossible to believe [=I cannot believe] that he's telling the truth.
• an impossible dream
b : very difficult
• an impossible [=hopeless] situation
• These math problems are impossible!
2 [more ~; most ~] of a person : very difficult to deal with : very irritating or annoying
• You refuse to help and then criticize me for not doing it right? You're impossible!
• My boss is just an impossible woman.
the impossible : something that cannot be done or that is very difficult
• Expecting people to do a good job in such a short time is asking the impossible.
- im·pos·si·bly /ɪmˈpɑːsəbli/ adv
• The restaurants in this city are impossibly [=extremely, ridiculously] expensive.
• impossibly high standards