indefatigability

noun

in·​de·​fat·​i·​ga·​bil·​i·​ty ¦ində̇ˌfat|ə̇gə¦bilətē 

-dēˌ-, 

-at|, 

|ēg-, 

-ətē, 

-i

plural -es

: the quality or state of being indefatigable

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