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indefatigable

in·de·fat·i·ga·ble [ ìndi fáttigəb'l ]


adjective 
Definition:
 
untiring: never showing any sign of getting tired or of relaxing an effort

[Early 17th century. Directly or via French< Latin indefatigabilis< defatigare "tire out" < fatigare "to tire"]

in·de·fat·i·ga·bil·i·ty [ ìndi fàttigə bíllətee ] noun
in·de·fat·i·ga·bly adverb
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