say it: SEE-slis
ceaseless is an adjective meaning "uninterrupted in time and indefinitely long continuing". It carries one recorded sense.
uninterrupted in time and indefinitely long continuing
“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”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for ceaseless come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.