Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Old French
Origin: Latin insatiabilis, from satiare 'to satisfy'

insatiable

 adjective
     
in‧sa‧tia‧ble
always wanting more and more of something
insatiable appetite/desire/demand etc (for something)
his insatiable appetite for power
our insatiable thirst for knowledge
—insatiably adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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