indefatigability

in·de·fat·i·ga·ble

 (ĭn′dĭ-făt′ĭ-gə-bəl)

adj.

Having or showing a capacity for persistent effort; not tiring or relenting: See Synonyms at tireless.

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[Obsolete French indéfatigable, from Latin indēfatīgābilis : in-, not; see in-¹ + dēfatīgāre, to tire out (dē-, intensive pref.; see de- + fatīgāre, to weary).]

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in′de·fat′i·ga·bil′i·ty n.

in′de·fat′i·ga·bly adv.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Thesaurus

Noun

1.

indefatigability - tireless determination indefatigableness, tirelessness determination, purpose - the quality of being determined to do or achieve something; firmness of purpose; "his determination showed in his every movement"; "he is a man of purpose"

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