fatigability

noun
fa·​ti·​ga·​bil·​i·​ty
variants: also fatiguability \ fə-​ˌtē-​gə-​ˈbil-​ət-​ē How to pronounce fatiguability (audio) , ˌfat-​i-​gə-​ How to pronounce fatiguability (audio) \
plural fatigabilities

Medical Definition of fatigability

: susceptibility to fatigue