without rest; tirelessly; incessantly
Describes an action continuing without pause or break; often used with verbs of working, moving, or occurring.
He kept working without rest.
It has been raining incessantly.
Standard kanji-kana spelling.
Variant using 無く; less common but still seen.
Formed from the noun 休み (rest, break) + なく (adverbial form of ない, 'not'). The combination functions as an adverb meaning 'without rest'.