This means you do something without doing something else. It is a formal way to say "without doing X".
Verb [dictionary form] + ことなくPrimary
This means you do something without doing something else. It is a formal way to say "without doing X".
彼は一言も文句を言うことなく、最後まで仕事をやり遂げた。
He completed the job to the very end without saying a single word of complaint.
休むことなく続いた研究が、ついに実を結んだ。
The research, which continued without rest, finally bore fruit.
彼はためらうことなく挑戦したが、成功することはなかった。
He took on the challenge without hesitation, but he was not successful.
今後も気を緩めることなく、業務に励んでまいります。
We will continue to devote ourselves to our duties without letting our guard down.
このシステムは、ユーザーが意識することなく、自動でデータをバックアップします。
This system automatically backs up data without the user being aware of it.
This phrase can show that something good happened. It means the main action went well. This is because another action did not happen. It makes the main action seem special.
This phrase is very formal. It is like saying 'without doing something' in a very serious way. '〜ずに' is also formal, but a little less so. '〜ないで' is the most common way. You can use '〜ないで' in talking and writing. It is not too formal or too casual.
Don't use this when you talk to friends. It sounds too formal. For example, don't say "宿題をすることなく遊びに行った" (I went to play without doing homework) to your friend.
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