形容词

1. (常指令人不快的事)不停歇的，无休止的，不断的
If something, often something unpleasant, is ceaseless, it continues for a long time without stopping or changing.

1. uninterrupted in time and indefinitely long continuing

e.g. the ceaseless thunder of surf
in constant pain
night and day we live with the incessant noise of the city
the never-ending search for happiness
the perpetual struggle to maintain standards in a democracy
man's unceasing warfare with drought and isolation
unremitting demands of hunger

Synonym: constantincessantnever-endingperpetualunceasingunremitting