DictionaryRoot: satiare
Latin
satiare
fill full, satisfy
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adjective
insatiable
in-SAY-shuh-bul/ɪnˈseɪʃəbl/
Always wanting more and impossible to satisfy.
Etymology
Satiare means to fill something full or satisfy it, so insatiable describes what cannot reach that point. The image is of an appetite or desire for which nothing is ever enough.