What does fatiguing mean?
Fatiguing describes anything that causes tiredness or exhaustion, whether through sustained physical effort, mental strain, or sheer monotony. A fatiguing task drains energy over time: a long march, an overnight drive, or hours of concentrated study can all be described this way. The word carries a somewhat formal register compared with everyday alternatives like 'tiring' or 'exhausting', which makes it especially common in occupational health, medicine, military writing, and sport science, where distinguishing genuinely draining activity matters. Its connotations are almost entirely negative, since it signals depletion rather than challenge enjoyed. Derived from 'fatigue', a word borrowed from French in the seventeenth century and traceable to Latin 'fatigare' ('to weary'), it belongs to a small family that includes 'indefatigable' — meaning tireless — so the same ancient root gives English both the burden of exhaustion and the praise of those who never succumb to it.
Causing tiredness or exhaustion; wearing out physical or mental energy.
"The fatiguing journey across the desert took nearly three weeks."
More formal than 'tiring'; frequent in medical, military, and occupational-health writing.
Present participle of the verb 'fatigue': to cause someone to become tired.
"The relentless schedule was fatiguing even the most experienced nurses."
The word that exhausts you even as you say it comes straight from the Latin for weariness — and its cousin 'indefatigable' literally means 'un-tireable'.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fatiguing
Fatiguing derives from 'fatigue', borrowed into English from French in the seventeenth century. French took the word from Latin 'fatigare', meaning 'to weary or tire out', a verb whose deeper origins are uncertain but whose sense has remained remarkably stable across millennia. The same Latin root yields 'indefatigable' — literally 'not able to be tired out' — via the negative prefix in-, making it a direct sibling rather than an inflection.
Related word forms
How fatiguing is actually used
Used chiefly in evaluative descriptions of activities, work, journeys, or tasks; slightly more formal than 'tiring' and common in medical, occupational-health, and sports contexts. It also functions as the present participle of the verb 'fatigue' (e.g., 'the workload was fatiguing the crew'), but its dominant use today is adjectival.
Easily confused with fatiguing
'Fatuously' means sillily or inanely, from 'fatuous', whereas 'fatiguing' means tiring, from 'fatigue'; the words merely share a superficial sound resemblance.