incessant

[in-ses-uhnt]
adjective
continuing without interruption; ceaseless; unending: an incessant noise.

Origin:
1425–75; late Middle English incessaunte < Late Latin incessant-, equivalent to Latin in- in-3 + cessant- (stem of cessāns), present participle of cessāre to stop work; see cease, -ant

incessancy, incessantness, noun
incessantly, adverb


unceasing, constant, continuous, never-ending, perpetual; eternal, everlasting; relentless, unrelenting, unremitting.


intermittent.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
incessant (ɪnˈsɛsənt)
 
adj
not ceasing; continual
 
[C16: from Late Latin incessāns, from Latin in-1 + cessāre to cease]
 
in'cessancy
 
n
 
in'cessantness
 
n
 
in'cessantly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

incessant
1461 (implied in incessantly), from O.Fr. incessant (1358), from L.L. incessantem (nom. incessans) "unceasing," from L. in- "not" + cessantem (nom. cessans), prp. of cessare "cease."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It has become nothing but tiresome, incessant blathering.
Instead, he attributed change to internal qualities of individuals that favour
  them in incessant struggle for existence.
Incessant beeping changes in tone and pitch for maximum annoyance.
Long before human communication evolved into incessant tapping on computer
  keys, people scratched on eggshells.
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