Grammar › N1 · 07 Possibility, necessity and limits
〜ことなく: without ...ing
N1 · 07 Possibility, necessity and limits
Says that something continues without a certain thing happening.
Verb dictionary form + ことなく. Written and formal. Compare 〜ないで, which is plain. Also ことなしに, which is stiffer and used similarly.
Examples
彼は一度も休むことなく、十年間働き続けた。
He kept working for ten years without taking a single break.
彼女は誰にも知られることなく、静かに町を去った。
She quietly left the town without anyone knowing.