EXTEMPORARY
Meaning of EXTEMPORARY in English
adjective
Synonyms: extemporaneous , autoschediastic, extempore, impromptu, improvised, offhand, spur-of-the-moment, unrehearsed, unstudied
Merriam Webster.
Collegiate thesaurus English vocabulary.
Английский энциклопедический словарь тезаурус.
2003