expression
without hesitation; without a qualm; at the drop of a hat
Adverbial phrase meaning to do something immediately and without any hesitation or reluctance. Often used when someone acts decisively or without second thoughts.
彼はためらわずに質問に答えた。
He answered the question without hesitation.
彼女はためらわずに寄付を申し出た。
She offered to donate without a qualm.