adj. 25B6; adjective IMMEDIATE, instant, on-the-spot, prompt, swift, speedy, rapid, quick, express, lightning; sudden, hurried, precipitate; informal snappy, p.d.q. (pretty damn quick).
delayed.
INSTANTANEOUS
Meaning of INSTANTANEOUS in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012