1. (adj) impossible
something that cannot be done
Antonyms: viable, manageable, attainable, doable, affirmable, tolerable, feasible, accomplishable, executable, thinkable, achievable, workable, mathematical, realizable, possible, contingent, assertable, practicable, come-at-able
2. (adj) impossible
not capable of occurring or being accomplished or dealt with
Synonyms: unimaginable, insufferable, inconceivable, unacceptable, out of the question, unsufferable
Antonyms: achievable, workable, viable, attainable, executable, manageable, contingent, feasible, thinkable, accomplishable, realizable, practicable, possible, assertable, doable, affirmable, come-at-able, tolerable, mathematical
3. (adj) impossible, inconceivable, out of the question, unimaginable
totally unlikely
Synonyms: unimaginable, insufferable, inconceivable, unacceptable, impossible, out of the question, unsufferable
Antonyms: achievable, come-at-able, possible, workable, manageable, feasible, affirmable, thinkable, accomplishable, tolerable, mathematical, practicable, assertable, realizable, attainable, executable, contingent, viable, doable
4. (adj) impossible, insufferable, unacceptable, unsufferable
used of persons or their behavior
Synonyms: unaccepted, impossible, insufferable, out of the question, unsufferable, unacceptable, unimaginable, inconceivable
Antonyms: attainable, practicable, contingent, realizable, workable, accomplishable, executable, affirmable, possible, achievable, assertable, doable, viable, come-at-able, tolerable, manageable, mathematical, feasible, thinkable
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Synonyms for impossible 
