Dictionary / Vocabulary / 間髪を入れず
かんぱつをいれず · also かんはつをいれず
immediately; instantly; with nary a pause; without a moment's delay
Also written 間髪をいれず、間髪を容れず
間髪を入れず、迅速かつ的確な応対、畏れ入ります。
Such an accurate, lightning-quick reply. What can I say?
トムは間髪を入れず、返答した。
Tom responded instantly.