Capable of becoming tired or exhausted; able to be worn out or weakened through effort or use.
From Latin 'fatigabilis' (able to be wearied), derived from 'fatigare' (to tire out) + '-able' suffix. Entered English in the late 1600s, primarily used in scientific and medical contexts.
Every human body is 'fatigable'—that's just a fancy word for 'able to get tired.' But the word really shines in engineering when scientists talk about how metals become 'fatigable' under pressure, which is why airplane wings are designed with special curves to resist metal fatigue.
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