Meaning of FUNCTIONAL in English
adj. 25B6; adjective
a small functional kitchen : PRACTICAL, useful, utilitarian, utility, workaday, serviceable; minimalist, plain, simple, basic, modest, unadorned, unostentatious, no-frills, without frills; impersonal, characterless, soulless, institutional, clinical.
the machine is now fully functional : WORKING, in working order, functioning, in service, in use; going, running, operative, operating, in operation, in commission, in action; informal up and running.
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012