insatiable

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in·sa·tia·ble / inˈsāshəbəl/ • adj. (of an appetite or desire) impossible to satisfy: an insatiable hunger for success. ∎  (of a person) having an insatiable appetite or desire for something, esp. sex.DERIVATIVES: in·sa·tia·bil·i·ty / -ˌsāshəˈbilitē/ n.in·sa·tia·bly / -blē/ adv.