insatiable

[in-sey-shuh-buhl, -shee-uh-]
adjective
not satiable; incapable of being satisfied or appeased: insatiable hunger for knowledge.

Origin:
1400–50; late Middle English insaciable < Latin insatiābilis; see in-3, satiable

insatiability, insatiableness, noun
insatiably, adverb


voracious, unquenchable, bottomless.
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World English Dictionary
insatiable or insatiate (ɪnˈseɪʃəbəl, -ʃɪə-, ɪnˈseɪʃɪɪt)
 
adj
not able to be satisfied or satiated; greedy or unappeasable
 
insatiate or insatiate
 
adj
 
insatia'bility or insatiate
 
n
 
in'satiableness or insatiate
 
n
 
in'satiateness or insatiate
 
n
 
in'satiably or insatiate
 
adv
 
in'satiately or insatiate
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

insatiable
c.1420, from L.L. insatiabilis, from in- "not" + satiabilis (see satiate (v.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
These insatiable fish will also prey upon one another.
It is a world driven by insatiable gadget lust and no small amount of money.
Addiction is an insatiable drive to use a drug because of the pleasure it
  affords and the side effects of craving that pleasure.
It is difficult to empathize if you don't understand, have insatiable needs or
  fear those around you.
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