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