noun, noun which may take the genitive case particle 'no'
ceaseless; constant; uninterrupted
A yojijukugo meaning something continues without pause or interruption. Often used in formal or literary contexts.
彼の常住不断の努力が実を結んだ。
His ceaseless efforts bore fruit.
常住不断の警戒が必要だ。
Constant vigilance is necessary.
A yojijukugo composed of 常住 (permanent dwelling, constant presence) and 不断 (unceasing, constant). The combination reinforces the meaning of something that continues without interruption.