expression, adverb
without delay; promptly; immediately
Formal adverbial phrase used in official, legal, or business contexts to indicate that an action should be taken without any delay. Often found in written instructions or regulations.
契約書に署名の上、遅滞なくご返送ください。
Please sign the contract and return it without delay.
問題が発生した場合は、遅滞なく上司に報告すること。
If a problem occurs, report it to your supervisor promptly.
すぐに is a common, everyday word for 'immediately' or 'right away'. 遅滞なく is more formal and often used in official or written contexts.
直ちに also means 'immediately' and is formal, but it can imply a sense of urgency or instantaneous action. 遅滞なく emphasizes the absence of delay in a procedural sense.
Compound of 遅滞 (chitai, 'delay') + なく (naku, adverbial form of ない 'not'), literally 'without delay'.