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indefatigability (n.)

1630s, from indefatigable + -ity. Indefatigableness is from 1650s; indefatigation from 1640s.

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Definitions of indefatigability from WordNet

indefatigability (n.)
tireless determination;
Synonyms: indefatigableness / tirelessness
From wordnet.princeton.edu