Definition of forthwith in English:

forthwith

Line breaks: forth|with
Pronunciation: /fɔːθˈwɪθ
 
, -ð/

adverb

(Especially in official use) immediately; without delay: we undertake to pay forthwith the money required
More example sentences
  • In order to ensure the continuing maintenance and supply of water it is essential that all outstanding rates are paid forthwith.
  • I shall be instructing my bank to cancel my direct debit to them forthwith.
  • The sum of $43,000 will be paid forthwith to the solicitors of each party.
Synonyms
immediately, at once, instantly, directly, right away, straight away, now, this/that (very) minute, this/that instant, then and there, there and then, here and now, in/like a flash, instantaneously, by return, post-haste, without delay, without further/more ado, without hesitation, unhesitatingly; quickly, as quickly as possible, fast, speedily, with all speed, promptly, as soon as possible, a.s.a.p., expeditiously; North Americanmomentarily, in short order; Frenchtout de suite
informal straight off, toot sweet, pronto, double quick, p.d.q. (pretty damn quick), in double quick time, at warp speed
Indian informal ekdam
archaic straightway, instanter, forthright

Origin

Middle English (in the sense 'along with, at the same time'): partly from earlier forthwithal, partly representing forth with used alone without a following noun.

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