enervation

nouns

lack of vitality
"an enervation of mind greater than any fatigue"
is derived from
is a type of (narrower)
the property of lacking physical or mental strength; liability to failure under pressure or stress or strain
"his weakness increased as he became older"; "the weakness of the span was overlooked until it collapsed"
serious weakening and loss of energy
is derived from
surgical removal of a nerve
is a type of (narrower)
surgical removal of a body part or tissue