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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World English Dictionary
fatigue (fəˈtiːɡ)
1.  physical or mental exhaustion due to exertion
2.  a tiring activity or effort
3.  physiol the temporary inability of an organ or part to respond to a stimulus because of overactivity
4.  the progressive cracking of a material subjected to alternating stresses, esp vibrations
5.  the temporary inability to respond to a situation or perform a function, because of overexposure or overactivity: compassion fatigue
6.  a.  any of the mainly domestic duties performed by military personnel, esp as a punishment
 b.  (as modifier): fatigue duties
7.  (pl) special clothing worn by military personnel to carry out such duties
vb , -tigues, -tiguing, -tigued
8.  to make or become weary or exhausted
9.  to crack or break (a material or part) by inducing fluctuating stresses in it, or (of a metal or part) to become weakened or fail as a result of fluctuating stresses
[C17: from French, from fatiguer to tire, from Latin fatīgāre]

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American Heritage
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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