adjective
Synonyms: impossible 1, impracticable, impractical, infeasible, irrealizable, unattainable, unrealizable, unworkable
Antonyms: feasible, practicable
adjective
Synonyms: impossible 1, impracticable, impractical, infeasible, irrealizable, unattainable, unrealizable, unworkable
Antonyms: feasible, practicable
Merriam Webster. Collegiate thesaurus English vocabulary. Английский энциклопедический словарь тезаурус. 2003