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.
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.
Standard kanji spelling for this adverbial phrase.
Variant spelling using 無く instead of なく; less common but still encountered.
Compound of 遅滞 (chitai, 'delay') + なく (naku, adverbial form of ない 'not'), literally 'without delay'.