immediately; instantly; without a moment's delay
Emphasizes that an action follows another with virtually no gap in time. Often used in narrative or formal contexts. The reading かんぱついれず is an irregular but common variant.
See also: 間髪を入れず
He answered the question without a moment's delay.
The next batter stepped into the batter's box immediately.
Standard kanji spelling using 入れる.
Kana spelling of 入れ, common in everyday writing.
From the expression 間髪を入れず (kanhatsu o irezu), literally 'without putting a hair's breadth in between'. The kanji 間 (interval) and 髪 (hair) combine to suggest an extremely small gap.