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insatiable (adj) unable to be satisfied.
An insatiable thirst can never be satisfied. An insatiable curiosity can never be satisfied; the more you know the more you want to know. An insatiable appetite is the desire to eat more and more, always wanting to eat more and more. The demand for new gadgets is insatiable if there is more and more demand for them, and the demand growing.
- The scientist's insatiable thirst for knowledge confined him to his books and to the laboratory. The more he knew, the more he wanted to know.
- Shylock's insatiable greed made him inhuman. When his daughter eloped with all the gold in the house, he was more worried about the gold than about the safety of his daughter.