i-adjective
incessant; constant; continuous; perpetual; everlasting
Describes something that continues without pause or interruption. Often used for sounds, efforts, or abstract ongoing states.
絶え間ない雨が三日も続いている。
The incessant rain has continued for three days.
彼の絶え間ない努力が成功につながった。
His constant efforts led to success.