Often used in negative constructions like 間断なく (without a break, incessantly) to emphasize continuity. More formal than 途切れ or 中断.
The rain continues to fall without a break.
He succeeded through unceasing effort.
continuously; constantly; incessantly
Compound of 間 (interval, space) and 断 (cut off, interrupt). The combination conveys the idea of a temporal gap or cessation.