Definition of forthwith in English:

forthwith

Syllabification: forth·with
Pronunciation: /fôrTHˈwiTH
 
/

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, straightaway, posthaste, without delay, without hesitation; quickly, speedily, promptly
informal pronto

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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Pronunciation: əˈnɒm(ə)ləs
adjective
deviating from what is standard, normal, or expected