How to Say "exhaustion" in Spanish
The Spanish word for “exhaustion” is “fatiga” — A2 level. This is a very common word in everyday Spanish.

Examples
Siento una gran fatiga después de trabajar doce horas.
I feel great fatigue after working twelve hours.
La fatiga muscular es normal después de ir al gimnasio.
Muscle fatigue is normal after going to the gym.
El descanso es el mejor remedio contra la fatiga crónica.
Rest is the best remedy against chronic fatigue.
Gender of Fatiga
Even though it ends in 'a', it's worth remembering it's always feminine. Use 'la fatiga' or 'mucha fatiga'.
Stronger than Cansancio
While 'cansancio' is general tiredness, 'fatiga' usually implies a deeper, more heavy exhaustion.
Fatigue vs. Fatigues
Mistake: “Using 'fatigas' to mean army clothes.”
Correction: In Spanish, 'fatiga' refers to the feeling. Army uniforms are called 'uniforme de campaña'.
Related Translations
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