ずに済む・
These forms say that an action, expense, or unwanted consequence can be avoided while the situation still turns out adequately. The past form often conveys relief that something proved unnecessary.
What the ending adds
The key idea is not merely “without doing.” The ending 済む contributes the sense that this was enough: the matter was settled, or life could continue adequately, without the action.
Three forms in use
The surrounding context normally shows why avoiding the action is possible.
オンラインで手続きできたので、窓口へ行かずに済んだ。
The procedure could be completed online, so there was no need to go to the service counter.
AnalyzeCompleting the procedure online made the trip unnecessary.
予約を別の日に変更できるなら、キャンセル料を払わないで済む。
If the reservation can be moved to another day, the cancellation fee will not have to be paid.
AnalyzeChanging the date provides a way to avoid the expense.
このアプリを使えば、毎回パスワードを入力しなくて済む。
Using this app means there is no need to enter the password every time.
AnalyzeThe app makes repeated manual entry unnecessary.
早めに歯科へ行ったので、抜歯せずに済んだ。
An early visit to the dentist meant that extraction could be avoided.
AnalyzeThis shows the special form せず used with a verb formed from a noun plus する.
More than simply doing without
Plain ずに only describes doing one thing without doing another. Adding 済む says that not doing it was sufficient and that the situation was successfully handled.
More examples
雨が弱まったので、タクシーを呼ばずに済んだ。
The rain eased, so there was no need to call a taxi.
Analyze電子版があれば、重い本を持ち歩かないで済む。
With a digital edition, there is no need to carry a heavy book around.
Analyze近所で買えたので、送料を払わなくて済んだ。
It was available nearby, so the shipping fee did not have to be paid.
Analyze説明書を読めば、店に問い合わせずに済む。
Reading the instructions means there is no need to contact the store.
Analyze会議がオンラインになり、出張しないで済んだ。
The meeting moved online, so a business trip was no longer necessary.
Analyzeバックアップが残っていて、全部作り直さなくて済んだ。
A backup remained, so there was no need to recreate everything.
Analyze