Adynamia -

A decrease in "vital power" that leads to a reduction in behavior, thought, and feelings normally present. It is closely related to avolition (decreased motivation for purposeful activities) and apathy .

Adynamia is often categorized based on whether it affects motor function, speech, or general motivation: adynamia

is a medical condition characterized by a pathological lack of strength, vigor, or "vital power". Unlike general tiredness, it is specifically defined by a difficulty in initiating goal-directed behaviors, thoughts, or emotions. While it is most frequently discussed as a neurological symptom following brain injury, it also appears in specific hereditary muscular disorders. 1. Clinical Definitions and Variants A decrease in "vital power" that leads to

A specific language impairment where a person has difficulty spontaneously initiating and elaborating on verbal messages, even though their actual language skills (like grammar and naming) remain intact. Unlike general tiredness, it is specifically defined by

Also known as hyperkalemic periodic paralysis, this is a genetic condition featuring intermittent attacks of muscle weakness or paralysis associated with elevated serum potassium levels.