neurasthenia

neur·as·the·nia

noun \ˌn(y)u̇r-əs-ˈthē-nē-ə\

Definition of NEURASTHENIA

: a condition that is characterized especially by physical and mental exhaustion usually with accompanying symptoms (as headaches, insomnia, and irritability), is believed to result from psychological factors (as depression or emotional stress or conflict), and is sometimes considered similar to or identical with chronic fatigue syndrome