1. (adverb)immediately, instantly, straightaway, straight off, directly, now, right away, at once, forthwith, like a shot without delay or hesitation; with no time intervening Synonyms: now, at one time, straight, at present, like a shot, instantly, instantaneously, in a flash, at once, outright, nowadays, at a time, today, direct, directly, forthwith, promptly, straight off, straightaway, right away, flat, immediately
Synonyms and Antonyms of forthwith 
