adjective
1.
not capable of being realized or attained
impossible goals
Synonyms: impracticable, impractical, infeasible, irrealizable, unattainable, unfeasible, unrealizable, unworkable
Related Word: absurd, inexecutable, unobtainable, unreasonable, unthinkable
Idioms: out of the question
Contrasted words: attainable, feasible, realizable; practicable, practical, rational, reasonable
Antonyms: possible
2.
Synonyms: hopeless 2, cureless, immedicable, incurable, insanable, irremediable, irreparable, uncorrectable, uncurable, unrecoverable