indefatigable [in-di-fat-i-guh-buh l]
1. incapable of being tired out; not yielding to fatigue; untiring.
tireless, inexhaustible, persevering.
Origin: 1580-90; < Latin indēfatīgābilis untiring, equivalent to in- in-+ dēfatīgā (re) to tire out (see de-, fatigue ) + -bilis -ble
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