inconceivable
[adjective]
Synonyms: unimaginable, beyond belief, incomprehensible, incredible, mind-boggling (informal), out of the question, unbelievable, unheard-of, unthinkable

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Antonyms: conceivable
Contrasted words: comprehensible, imaginable, knowable, understandable, believable, convincing, credible, plausible
Related Idioms: beyond one's grasp

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English Thesaurus: impossible, impractical, out of the question, there’s no way, inconceivable, ...

[TahlilGaran] English Synonym Dictionary ▲

in‧con‧ceiv‧a‧ble AC /ˌɪnkənˈsiːvəbəl/ adjective
[Word Family: verb: conceive; noun: conception; adjective: conceivable ≠ inconceivable]
too strange or unusual to be thought real or possible:
A few years ago a car fuelled by solar energy would have been inconceivable.
It is inconceivable that a man in such a powerful position could act so unwisely.
—inconceivably adverb

[TahlilGaran] Dictionary of Contemporary English ▲

inconceivable
adj.
VERBS appear, be, seem | become | find sth She found the idea quite inconceivable.
ADV. quite, totally, utterly, wholly | almost, practically, virtually
PREP. to The thought of leaving her family was inconceivable to her.

[TahlilGaran] Collocations Dictionary ▲

impossible something that is impossible cannot happen or be done:
It’s impossible to get a taxi around here.
At times, finding a job felt like an impossible task.
impractical something that is impractical is too expensive, takes too much time, is too difficult etc and therefore it is not sensible to try to do it:
It’s a nice idea, but it’s totally impractical.
We cannot all just stop using our cars - that would be completely impractical.
an impractical suggestion
out of the question used when saying that something is completely impossible, especially because it is not allowed:
It’s out of the question for you to go alone.
there’s no way informal used when saying that you think something is completely impossible:
There’s no way we can get to the airport in less than an hour.
inconceivable impossible to imagine or believe:
It seemed inconceivable that there could be an end to the fighting in Northern Ireland.
unthinkable impossible to imagine or believe - used especially about something that seems very shocking to people:
In those days it was unthinkable for a lady to work outside the home.
unattainable impossible to achieve:
an unattainable goal
Victory seemed unattainable.
it can’t be done spoken used when saying very definitely that something is impossible:
I’m afraid it can’t be done.

[TahlilGaran] English Thesaurus ▲