un fatigable


susceptible to fatigue.

1600–10; < Latin fatīgābilis, equivalent to fatīgā(re) to tire + -bilis -ble

fatigableness, fatigability, noun
nonfatigable, adjective
unfatigable, adjective
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Medical Dictionary

fatigable fat·i·ga·ble (fāt'ĭ-gə-bəl)
Subject to fatigue.

fat'i·ga·bil'i·ty n.
The American Heritage® Stedman's Medical Dictionary
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