Fatigue
Part of speech: verb
Definition: to tire or make weary by physical or mental exertion to lose so much strength or energy that one becomes tired, weary, feeble or exhausted
Part of speech: noun
Definition: A weariness caused by exertion; exhaustion. A menial task, especially in the military. A type of material failure due to cumulative effects of cyclic loading.
Malaise
Part of speech: noun
Definition: A feeling of general bodily discomfort, fatigue or unpleasantness, often at the onset of illness.An ambiguous feeling of mental or moral depression.Ill will or hurtful feelings for others or somesone.