What does fatigable mean?
"Fatigable" is a formal adjective describing someone or something capable of being fatigued — that is, subject to tiredness, weariness, or exhaustion. It applies naturally to human muscles and minds, as in physiology, where a fatigable muscle is one that loses strength with repeated use, but it can describe any person or system that tires under strain. The word is uncommon in everyday speech; most speakers reach for simpler phrasing such as "easily tired" or "prone to fatigue." Its chief interest lies in its relationship to its far better-known antonym, "indefatigable," meaning untiring or persistent. Where an indefatigable worker seems never to flag, a fatigable one frankly admits the limits of stamina. Found chiefly in medical, scientific, and literary registers, "fatigable" offers writers a precise, slightly elevated way to acknowledge human finitude — the simple truth that energy runs out and rest must follow.
adjectiveCapable of being fatigued; susceptible to tiredness or weariness.
- Capable of being fatigued; subject to tiredness or exhaustion.
"Even the most seasoned marathon runners remain fatigable after hours on the course."
"The physiotherapist noted that the patient's fatigable muscles improved steadily with resistance training."
"Unlike her indefatigable colleague, she was entirely fatigable and needed frequent breaks."
It took English centuries to coin the opposite of "indefatigable" — and when it did, it gave us this quietly obscure word that most dictionaries barely mention.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fatigable
"Fatigable" derives from the Latin root "fatigare," meaning to weary or exhaust, the same source that gave English the noun and verb "fatigue." The word was formed with the adjectival suffix "-able," indicating capability, likely by analogy with "indefatigable," which entered English from Latin via French somewhat earlier. It has been part of English since at least the early modern period, though it never achieved widespread use. Its Latin lineage connects it to cognates such as "fatigue" and "indefatigable."
How fatigable is actually used
"Fatigable" is rare and formal, appearing mostly in medical, physiological, or literary contexts. It is far less common than its famous antonym "indefatigable." In clinical writing it often describes muscles or cognitive capacity that tire readily.
Easily confused with fatigable
"Fatigue" is a noun meaning tiredness or a verb meaning to exhaust, while "fatigable" is an adjective describing something that can be fatigued.