IPA: /ɪnˈseɪʃəblnəs/
KK: /ɪnˈseɪʃəblnəs/
A state of having an unquenchable desire or appetite that cannot be satisfied.
Her insatiableness for knowledge drove her to read every book she could find.
Insatiableness → It is formed from "in-" (meaning not), "satiare" (meaning to satisfy), and "-ness" (meaning a state or quality). The word describes the state of being not satisfied or having an unquenchable desire.
Think of 'not satisfied' ('in-') and 'to satisfy' ('satiare') to remember that insatiableness means a state of never being satisfied.