Fatigable

Part of speech: adjective

Definitions

1. Subject to exhaustion or weariness due to exertion or stress
2. Able to experience a decrease in energy or vitality when faced with physical or mental demands
3. Having the capacity to grow weary or lose strength under strain or effort

Etymology: "Fatigable" is a word that is simply the opposite of "indefatigable," and its history follows that of its more famous negative twin. It came into English by borrowing from French "fatigable," which itself descends from Latin "fatīgābilis," meaning "capable of being wearied." That Latin adjective is built from "fatīgāre," to weary or tire out, the verb that also gave English "fatigue." The Latin root "fatīgō" carries the sense of wearing something down through repeated effort or strain, so the adjective describes a thing or person that can be worn down in this way. English kept the word close to its French form, and it remains a relatively uncommon term, mostly found in formal or descriptive writing where a plain "tiring easily" would feel too loose.

Synonyms: tiring, exhaustible, wearisome, draining, taxing

Antonyms: invincible, unfatigable, indefatigable, unyielding, unwearying