impossible
adjective
im·pos·si·ble
(ˌ)im-ˈpä-sə-bəl 
1
a
: incapable of being or of occurring
It's impossible to tell the future.
b
: felt to be incapable of being done, attained, or fulfilled : insuperably difficult
an impossible deadline
2
a
: extremely undesirable : unacceptable
in an impossible situation
b
: extremely awkward or difficult to deal with
The actor was impossible on the set.
impossibleness
noun
Synonyms of impossible
Examples of impossible in a Sentence
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.
Recent Examples on the Web
Microscopic flaws also create electrical issues, leaking energy that is almost impossible to track with conventional tools.
—
Mrigakshi Dixit, Interesting Engineering, 12 Jan. 2026
Protesters said the demonstration was meant to reflect democratic participation in its most visible form — expressive, passionate, and impossible to ignore.
—Da Lin, CBS News, 11 Jan. 2026
Bell-to-bell cell-phone bans are a promising start, but a social media ban in our culture is likely impossible to effectively implement.
—Mary Ellen Klas, Twin Cities, 11 Jan. 2026
Park hailed the resilience of the community, and how residents organized block by block when there was no roadmap for recovery, and insurance and bureaucratic processes felt impossible to navigate alone.
—City News Service, Daily News, 10 Jan. 2026
See All Example Sentences for impossible
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Cite this Entry
“Impossible.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/impossible. Accessed 13 Jan. 2026.
Kids Definition
impossible
adjective
im·pos·si·ble
(ˈ)im-ˈpäs-ə-bəl
1
a
: incapable of being or of occurring
b
: very difficult : hopeless
an impossible situation
2
: very bad or unpleasant
an impossible person
impossibly
adverb
-blē
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