Definition of forthwith in US English:

forthwith

adverb

  • (especially in official use) immediately; without delay.

    ‘we undertake to pay forthwith the money required’
    • ‘I will retract my tuition forthwith and find a profession more suited to the quiet dignity of my sunset years.’
    • ‘All arrears owed for Mark's tutoring are to be paid by Mr. Zito forthwith.’
    • ‘Right, well, I am left with no option but to dismiss you forthwith and to insist on your immediate deportation.’
    • ‘The sum of $43,000 will be paid forthwith to the solicitors of each party.’
    • ‘I have been commanded to return them to the property forthwith so they can be consulted at a moment's notice.’
    • ‘A short while later, we heard a distant bugle and forthwith the entire camp marched down.’
    • ‘Property lodged with the creditor has, thereupon, to be returned by him forthwith.’
    • ‘It is an evil application, and should be banned forthwith.’
    • ‘To correct this impression, I stopped making those cracks forthwith.’
    • ‘They must rediscover their hunting instincts forthwith.’
    • ‘There is a more pernicious red herring that needs to be smelled out forthwith.’
    • ‘These costs are not payable forthwith but will be paid in any event of the cause.’
    • ‘Sure, the pressure feels real - and, naturally, I will be embarking on the Greek Doctor's diet forthwith.’
    • ‘If he's gotten the word to spin this their way, that dynamic will change forthwith.’
    • ‘We will be taking these golf carts and returning to London forthwith.’
    • ‘In order to ensure the continuing maintenance and supply of water it is essential that all outstanding rates are paid forthwith.’
    • ‘He did not claim asylum at the airport because he was afraid that he would be returned forthwith to Malaysia.’
    • ‘I shall be instructing my bank to cancel my direct debit to them forthwith.’
    • ‘It is clear that the Lincoln belongs to Yorkdale and should be returned to it forthwith.’
    • ‘Neither cost orders, which were made payable forthwith, have been paid.’
    immediately, at once, instantly, directly, right away, straight away, now, that minute, this minute, that very minute, this very minute, that instant, this instant, then and there, there and then, here and now, in a flash, like a flash, instantaneously, by return, post-haste, without delay, without further ado, without more ado, without hesitation, unhesitatingly
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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.

Pronunciation

forthwith

/fôrTHˈwiTH//fɔrθˈwɪθ/