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