/ ɪnˈseɪʃəbl; NAmE / adjective
always wanting more of sth; not able to be satisfied :
an insatiable appetite / curiosity / thirst
There seems to be an insatiable demand for more powerful computers.
► in·sati·ably / -ʃəbli; NAmE / adverb
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WORD ORIGIN
late Middle English : from Old French insaciable or Latin insatiabilis , from in- not + satiare fill, satisfy, from satis enough.