1. (adj) ageless, aeonian, eonian, eternal, everlasting, perpetual, unending, unceasing
continuing forever or indefinitely
"the ageless themes of love and revenge"; "eternal truths"; "life everlasting"; "hell's perpetual fires"; "the unending bliss of heaven"
2. (adj) ceaseless, constant, incessant, never-ending, perpetual, unceasing, unremitting
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"
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Definition of 'unceasing' 
