1) Impossible to satisfy 2) Insatiable 3) Limitless in a way 4) Quenchless 5) Unquenchable 6) Unsated 7) Unsatiable 8) Unsatiated 9) Unsatisfiable 10) Unsatisfied 1) Insatiable 2) Quenchless 3) Unquenchable 4) Unsated 5) Unsatiable 6) Unsatiate 7) Unsatiated 8) Unsatisfiable 9) Unsatisfied 
• (a.) Insatiable; as, insatiate thirst.
In·sa'ti·ate adjective [ Latin insatiatus .] Insatiable; as, insatiate thirst. « The insatiate greediness of his desires.» Shak. « And still insatiate , thirsting still for blood.» Hook. 
[adj] - impossible to satiate or satisfy
insatiable adjective impossible to satisfy; `an insatiate appetite`; `an insatiable demand for old buildings to restore`; `his passion for work was unsatiable`
insatiable: insatiate greed.