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Idiopathic chronic fatigue

chronic fatigue with no known cause not meeting the criteria for chronic fatigue syndrome

Pronunciation
/ˌɪdɪəʊˈpaθɪk ˈkrɒnɪk fəˈtiːɡ/
/ˌɪdiəˈpæθɪk ˈkrɑnɪk fəˈtiɡ/