continuously; constantly; incessantly
Describes an action or state that continues without pause or interruption. Often used in formal or written contexts.
He kept working continuously without a break.
It has been raining incessantly.
From 間断 (かんだん, 'pause; interruption') + なく (adverbial form of ない, 'without'). The compound 間断 is composed of 間 (interval) and 断 (cut off).