Definition of impossible
- an impossible deadline
- the actor was impossible on the set
It's impossible to predict the future.
The heavy rain made it impossible to see the road.
It's physically impossible for a child to lift that much at once.
It's virtually impossible to book a flight just before the holiday.
These math problems are impossible!
You refuse to help and then criticize me for not doing it right? You're impossible!
My boss is just an impossible woman.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'impossible.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use: 14th centurySee Words from the same year
: unable to be done or to happen : not possible
: very difficult
of a person : very difficult to deal with : very irritating or annoying
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